Finding the Third Proportional to 425,229 and 639,766.50

Step by Step Solution

1. Step 1: Write the proportion equation
   425,229 : 639,766.50 = 639,766.50 : x
2. Step 2: Convert to fraction form
   425,229/639,766.50 = 639,766.50/x
3. Step 3: Cross multiply
   425,229x = 639,766.50 × 639,766.50
4. Step 4: Simplify right side
   425,229x = 409,301,174,522.25
5. Step 5: Solve for x
   x = 409,301,174,522.25/425,229
6. Step 6: Final answer
   x = 962,542.95