'Append predicted values from timeseries analysis to dataset python

I have a problem appending my forecasted values to my data. My data is looking like the following:

and my predicted values looks like the following:

Can anybody help? I have tried appending with the following for-loop, but with no success:

for row in forecasts_predicted1:
         data.append(row)

But with no luck, as the predicted value row is just the number.

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