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Will something like this work for you? It basically finds the three most recent non-null values and averages them. I transposed the data and filtered out the nulls...then used a running total tool on the terminal value to get the highest value of each remaining month....sorted in descending order then sampled the top 3 and computed averages. I also concatenated the months used in the average so you could audit it to make sure it was grabbing the correct months. (workflow attached)