You got 3461.49999999999950000000? Because I didn't.

What's your OS name and version? What's your perl version? Perhaps we have a difference of some math library or something.

(Prior node quoted in entirety due to rash of prior "edit"s.)

So I edited my prior node to correct my mis-paste. Clearly "%.4f" would not yield that many trailing digits. To get 20 trailing digits, I clearly had used "%.20f" (which is what my node now shows). (I also replied as edits are not so easy to notice, naturally.)

Please try again.