If you need to forecast numbers -- typically for finance -- the Windows and Mac versions of Excel 2016 have a basket of tools to get the job done.
How to do forecasting with Excel 2016
Using Excel for Basic Forecast Smoothing
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Operations Management: Forecasting for Data with Trend and Seasonality in Excel
How to Create a Cash Flow Forecast using Microsoft Excel - Basic Cashflow Forecast
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Metrics to Compare Forecasts
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