Finding the Third Proportional to 423,513 and 636,209.50

Step by Step Solution

1. Step 1: Write the proportion equation
   423,513 : 636,209.50 = 636,209.50 : x
2. Step 2: Convert to fraction form
   423,513/636,209.50 = 636,209.50/x
3. Step 3: Cross multiply
   423,513x = 636,209.50 × 636,209.50
4. Step 4: Simplify right side
   423,513x = 404,762,527,890.25
5. Step 5: Solve for x
   x = 404,762,527,890.25/423,513
6. Step 6: Final answer
   x = 955,726.34