For a moving calculation, see: Table Calculation Type: Moving Calculation
For forecasting options, see: How Forecasting Works in Tableau
You will not be able to combine the two features, unfortunately, to do a FORECAST on top of the moving average. This is due to the fact that the moving average is a Table Calculation in Tableau, and these happen after query results are processed (they are local calculations on top of the aggregate data in your worksheet).
Best of luck and happy analyzing -- once you know the terminology/features of Tableau, Google searches work great!
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Why did you mark this ANSWERED???
You didn't answer my question and provided me with an answer using the attachment I provided??