Process: - Filter out pre-2017 data so it is not included in the forecast model - Create date field (not sure if this is needed) - Calculate running total of posts - ARIMA model on F3 (keep defaults) - TS forecast on model results - Union of pre-2017, Running Total, and predicted data - Combine post data into single field - Calculate running total - Filter out data where running total <1m - Select first record - Recreate date - Clean-up