SUM OF PREVIOUS columns , SAME ROW, conditional formating

There is an issue with City3 - the mark should be on station G, not H.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45Wcs4sqTRU0lEyMgAShkYgwhhEgLjmIIYpkLAAMcACsToQLUYw1eZQKRMgBmk0gtKmYHGYcmOoISZQFSZQXUZIuoCqYwE=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [City = _t, Capacity = _t, A = _t, B = _t, C = _t, D = _t, E = _t, F = _t, G = _t, H = _t]),
    #"Unpivoted Other Columns" = Table.UnpivotOtherColumns(Source, {"City", "Capacity"}, "Station", "Reported"),
    #"Changed Type" = Table.TransformColumnTypes(#"Unpivoted Other Columns",{{"Capacity", Int64.Type}, {"Reported", Int64.Type}}),
    #"Grouped Rows" = Table.Group(#"Changed Type", {"City"}, {{"Rows", each _, type table [City=nullable text, Capacity=nullable number, Station=text, Reported=nullable number]}}),
    Compute = (tbl)=> let
        #"Added Index" = Table.AddIndexColumn(tbl, "Index", 0, 1, Int64.Type),
        #"Added Custom" = Table.AddColumn(#"Added Index", "Full", each List.Accumulate({0..[Index]},[cumul=0],(state,current)=>[ cumul = if #"Added Index"[Capacity]{current}<=state[cumul] + #"Added Index"[Reported]{current} then  0 else state[cumul] + #"Added Index"[Reported]{current}]))
    in #"Added Custom",
    AddedCompute = Table.AddColumn(#"Grouped Rows","comp",each Compute([Rows])),
    #"Expanded comp" = Table.ExpandTableColumn(AddedCompute, "comp", {"Capacity", "Station", "Reported", "Full"}, {"Capacity", "Station", "Reported", "Full"}),
    #"Expanded Full" = Table.ExpandRecordColumn(#"Expanded comp", "Full", {"cumul"}, {"cumul"}),
    #"Removed Other Columns" = Table.SelectColumns(#"Expanded Full",{"City", "Capacity", "Station", "Reported", "cumul"}),
    #"Changed Type1" = Table.TransformColumnTypes(#"Removed Other Columns",{{"Capacity", Int64.Type}, {"Station", type text}, {"Reported", Int64.Type}, {"cumul", Int64.Type}})
in
    #"Changed Type1"

How to use this code: Create a new Blank Query. Click on "Advanced Editor". Replace the code in the window with the code provided here. Click "Done".

The yellow mark is equivalent to cumul=0