Control the Precision and Accuracy of Numerical Results using FindFor

Hello everyone. I have constructed an equatio as FindFormula[XVTimeM, x, SpecificityGoal → 6]; I want to display as many decimal numbers as possible. I have tried to write FindFormula[XVTimeM, x, SpecificityGoal → 6, 50] as per the last link. However, an error is returned. I have also tried to convert the result to input form but I would like to have more decimal numbers.

Can anybody help me?
Regards.
Jaime.

No, FindFormula works only with MachinePrecision up to 16 digits.

interpolate_this-Ver3.nb (70.2 KB)

I see. Thanks for answering.