Excel Formula To Get LAST Non-Zero Value in Row and Return Column Header

I currently have a spreadsheet of transactions, and I want to write a formula that will help me extract from each row a customer's most recent transaction.

Additionally, I want to then pull the column header associated with each most recent transaction, as to isolate the date on which the transaction occurred.

I have found the formula:

=INDEX($E$1:$CO$1, MATCH(TRUE,INDEX(E2:CO2<>0,),0)) 

This is giving me the most recent transaction; it is searching each row for the first non-zero instance.

I need the LAST non zero instance. Or alternatively, I need to know how to make this formula work from right to left, instead of left to right.

Any help is much appreciated!