Finding the Third Proportional to 639,494 and 938,505

Step by Step Solution

1. Step 1: Write the proportion equation
   639,494 : 938,505 = 938,505 : x
2. Step 2: Convert to fraction form
   639,494/938,505 = 938,505/x
3. Step 3: Cross multiply
   639,494x = 938,505 × 938,505
4. Step 4: Simplify right side
   639,494x = 880,791,635,025
5. Step 5: Solve for x
   x = 880,791,635,025/639,494
6. Step 6: Final answer
   x = 1,377,325.88