Calculate rolling past 3 months average sales and it should filter with year month filter.

[Anonymous]

Task to Perform: Calculate rolling past 3 months average sales and it should filter with year month filter. (eg if April 2020 is selected it should show sales for (Jan+Feb+March)/3)

I have two tables 1. d - Calendar Table (Date, MonthName, Year as my columns) & 2. F-Sales Table (Date, Sales). I have created a relationship between the two tables. Can anyone please tell me how to get the above requirement using DAX Measure from Scratch!! / DAX Measure code for reference

Any Inputs & Suggestions are highly appreciated

Thanks in Advance