Finding the Third Proportional to 639,492 and 938,502

Step by Step Solution

1. Step 1: Write the proportion equation
   639,492 : 938,502 = 938,502 : x
2. Step 2: Convert to fraction form
   639,492/938,502 = 938,502/x
3. Step 3: Cross multiply
   639,492x = 938,502 × 938,502
4. Step 4: Simplify right side
   639,492x = 880,786,004,004
5. Step 5: Solve for x
   x = 880,786,004,004/639,492
6. Step 6: Final answer
   x = 1,377,321.38