Forecast total display

i see something wrong in the  last line of your measure. You're using SUMX(TableForecast, Slope * TableForecast[ForecastDate] + Intercept) — this iterates over every row in TableForecast and sums all the predicted values, which is why you're getting 115K instead of the end-of-year number. You're summing the entire forecast line, not just the last point.

To get just the year-end value, you need to calculate the regression for a single specific date, the last date in your forecast table instead of summing across all of them:
daxVAR LastForecastDate = MAX(TableForecast[ForecastDate])
RETURN
Slope * LastForecastDate + Intercept
Replace the SUMX line and the RETURN Regression with that. The card will then show the predicted value at the end of the forecast period rather than the sum of all predicted values across the year.