Power BI TOP N

Hi ， Anonymous 

Here is a demo.

pbix attached

You need to create a calculate column first:

Row Number = COUNTROWS(FILTER('Table','Table'[Amount Dollar]>=EARLIER('Table'[Amount Dollar])))

Enter Table as below:

Then create the measure "pecentage by amount" as below  :

Measure =
VAR _topn =
    SELECTEDVALUE ( 'Table 2'[TOP N] )
VAR tab =
    TOPN ( _topn, 'Table', 'Table'[Amount Dollar] )
RETURN
    DIVIDE (
        SUMX ( tab, 'Table'[Amount Dollar] ),
        CALCULATE ( SUM ( 'Table'[Amount Dollar] ), ALL ( 'Table' ) )
    )

The result will show as below:

Best Regards,
Community Support Team _ Eason
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.