Filling values for missing dates for many attribute combinations

Hi kostask 
Here is the updated solution with correct subtotals https://we.tl/t-ULVbpV6vB9

FinalBalance1 = 
VAR CurrentDate =
    MAX ( 'Calendar'[Date] )
VAR IterationTable =
    CALCULATETABLE (
        SUMMARIZE ( 'Totals', 'Totals'[Bank], 'Totals'[Company], 'Totals'[AccountNo] ),
        ALL ( 'Calendar' )
    )
RETURN
    SUMX (
        IterationTable,
        CALCULATE (
            VAR CurrentValue =
                SUM ( 'Totals'[FinalBalance] )
            VAR CurrentAcountTable =
                CALCULATETABLE ( 'Totals', ALL ('Calendar' ) )
            VAR PreviousDatesTable =
                FILTER ( CurrentAcountTable, 'Totals'[Date] < CurrentDate )
            VAR PreviousDate =
                MAXX ( PreviousDatesTable, 'Totals'[Date] )
            VAR PreviousDateTable =
                FILTER ( PreviousDatesTable, 'Totals'[Date] = PreviousDate )
            VAR PreviousValue =
                SUMX ( PreviousDateTable, 'Totals'[FinalBalance] )
            RETURN
                - COALESCE ( CurrentValue, PreviousValue )
        )
    )