Assuming you named each table from top left corner where row headers and column headers intersect to bottom right corner of each table...
Also, Assuming your drop down list selection is in A2 and your vertical value input is in A3 and your horizontal value input is in A4, then try formula:
=INDEX(INDIRECT(A2),MATCH(A3,INDEX(INDIRECT(A2),0,1),0),MATCH(A4,INDEX(INDIRECT(A2),1,0),0))
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