Finding the Third Proportional to 423,517.50 and 636,221.25

Step by Step Solution

1. Step 1: Write the proportion equation
   423,517.50 : 636,221.25 = 636,221.25 : x
2. Step 2: Convert to fraction form
   423,517.50/636,221.25 = 636,221.25/x
3. Step 3: Cross multiply
   423,517.50x = 636,221.25 × 636,221.25
4. Step 4: Simplify right side
   423,517.50x = 404,777,478,951.56
5. Step 5: Solve for x
   x = 404,777,478,951.56/423,517.50
6. Step 6: Final answer
   x = 955,751.48