This can be very easily in Acrobat.

Create the three text fields and then set the properties by right clicking.
Choose the format tab and select numbers.

For the field that will be the sum you'd also choose the calculate field.
It's pretty self explanatory.

Bob
-----Original Message-----
From: InDesign Talk [mailto:indesign@lists.lassosoft.com] On Behalf Of John
Feld
Sent: Wednesday, June 16, 2010 11:55 AM
To: InDesign Talk
Subject: Re: indesign Digest #588

I have not paid much attention to the discussions on forms, as I hardly ever
make them.
Now I am regretting my inattention.
I need to create a PDF form from InDesign that will include several fields
that people will enter $ amounts, and these need to have a total
automatically reflected in a another field.
Ideally this would have multiple fields 2 of these equals $x, 3 of these
equals y etc. Then a sum of the x's and y's.
I have not been able to find any way to do this.
At present, this is all done manually, and the people who fill in the
amounts inevitably err in their arithmetic, and put in a number considerably
lower than is correct.
Has anyone discovered a way to do this in Acrobat?
TIA
John
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