Multiply a result for a value in other column

You can try this in new blank query and adjust according to your needs.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMtCztLQ0N1aK1UFlG8JFLAwt4GxzExM428wESZehpVJsLAA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Column1 = _t]),
    Type = Table.TransformColumnTypes(Source,{{"Column1", type number}}),
    NewColumn = Table.FromColumns( {Type[Column1], List.RemoveFirstN(List.Accumulate(Type[Column1],{1}, (s,c)=> s &  {List.Reverse(s){0}*c}), 1)}, {"A","B"}),
    FINAL = Table.TransformColumnTypes(NewColumn,{{"A", Percentage.Type}, {"B", Percentage.Type}})
in
    FINAL

Anonymous 

You cannot do calculation to change the existing column using DAX. You may only add another column C to have the result but you don't have column B without the calculation. So I am pretty sure you can not achieve this with DAX. 

Paul Zheng _ Community Support Team
Best Regards

say, you have a column that index each rows, such as 1,2,3....

B=PRODUTX(FILTER(Table,Table[Index]<=EARLIER(Table[Index])),Table[A])