=INDEX('1'!E10:E205,MATCH(B36,'1'!G10:G205, 0))
Okay so the row number returned at the moment is when '1'!G matches B36. You want to add another logical on the row number, offset to the start of the INDEX (indexed position). There are a couple of ways to do this:
First you can build a string of the two columns together for MATCH to evaluate and use wildcards:
=INDEX('1'!E10:E205,MATCH("x*"&B36,'1'!E10:E205&'1'!G10:G205, 0))
The * wildcard will allow for any number of any character so you will get what you are looking for.
Another way would be to use SMALL(IF()) to build an array of index postions and return the nth smallest:
=INDEX('1'!E10:E205,SMALL(IF(LEFT('1'!E10:E205,1)="x",IF('1'!G10:G205=B36,ROW('1'!G10:G205)-9)),ROW(10:10))) - This is an array formula; Ctrl + Shift + Enter While still in the formula bar