Thinking aloud, if you could guarantee 32-bit Excel was available you could 
probably use Excel automation to do it, i.e.

Create a Workbook programmatically
Fill defined cells with your input values
Do a Goal Seek with result in a defined cell
Read that value back to VFP.

    Range("B4").GoalSeek Goal:=-900, ChangingCell:=Range("B3")


-- 
  Alan Bourke
  alanpbourke (at) fastmail (dot) fm

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