In B12, copied down :
=INDEX(E$4:E$6,SUMPRODUCT((B$4:D$6=A12)*(ROW(B$4:B$6)-ROW($B$3))))
or, if you wanted to use VLOOKUP function, try this instead :
=VLOOKUP(A12,IF({1,0},INDEX(B$4:D$6,0,SUMPRODUCT((B$4:D$6=A12)*COLUMN($A1:$C1))),E$4:E$6),2,0)
Regards
Bosco