From what I can tell, you would just take the max of your first measure over your dimension members and the max of your 2nd member over your dimension members and then do some sort of calculation on it?

The following example takes the maximum reseller sales year total and the maximum internet orders year total and then multiplies them (in adventure works):

WITH MEMBER [MaxReseller]

AS

MAX

([Date].[Fiscal].[Fiscal Year], [Measures].[Reseller Sales Amount])

MEMBER [MaxInternet]

AS

MAX

([Date].[Fiscal].[Fiscal Year], [Measures].[Internet Order Count])

MEMBER MaxCalc

AS

MaxInternet*MaxReseller

SELECT

{[Measures].[Reseller Sales Amount], [Measures].[Internet Order Count],

MaxReseller, MaxInternet, MaxCalc } ON 0,

[Date].[Fiscal].[Fiscal Year] ON 1

FROM

[Adventure Works]

I hope that helps 🙂