Math Question

[Oorang]

This may be the dumbest question ever but I can't remember how to do this and all the sites that cover exponentiation do not speak to it. How do you solve for X in the following? I mean I could just put up a loop that would count how many times 2187will divide by 3, but I thought there was a better way.
3^X = 2187

 

[Oorang]

Final(?) code looks like this:

'Convert bytWeeks into a day of the week and store it for further use.
'Verify 1 (and only 1) day is selected. Make sure that one selected day is
'equal to the weekday of dtEval. First argument is for speed as the vast 
'majority of items will be 0. Last argument prevents Switch returning a
'null value and causing an error.

bytWeekday = VBA.Switch(bytWeek = 0, 0, bytWeek = 64, 1, bytWeek = 32, 2, bytWeek = 16, 3, bytWeek = 8, 4, bytWeek = 4, 5, bytWeek = 2, 6, bytWeek = 1, 7, bytWeek > 0, 0)

'If bytWeekday = 0, then no weekdays (or multiple weekdays) were selected.

If Not bytWeekday = 0 Then Err.Raise 513, "IsScheduledMonthly", "Illegal argument in bytWeekday"
blnIsWday = (VBA.Weekday(dtEval, vbSunday) = bytWeekday)