Seatch table for a best matching value and returning the column header

I have a forecast file that I did some tweaking so that the quantities are cumulative

Basically what I want to do is determine by which week a SKU depletes

I intend to do this via the method shown in my sample data

For step 1 I can use MATCH

For step 3 I should be able to derive it using the output from step 2 using the MATCH and COLUMN function

Only problem is, I cant get the MATCH function to work for step 2 since from what I understand, MATCH only works for exact figures and Hlookup wont work

What do I do?

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