Try:

=INDEX(C1:C5000,MATCH(1,(A1:A5000=X1)*(B1:B5000=MA X(IF(A1:A5000=X1,B1:B5000))),0))

confirmed with CTRL+SHIFT+ENTER

or

=Lookup(2,1/((A1:A5000=X1)*(B1:B5000=Z1)),C1:C5000)


where Z1 contains the Sumproduct result from your post.


--
NBVC

Where there is a will there are many ways.
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