Finding the Third Proportional to 402,616.50 and 622,605

Step by Step Solution

1. Step 1: Write the proportion equation
   402,616.50 : 622,605 = 622,605 : x
2. Step 2: Convert to fraction form
   402,616.50/622,605 = 622,605/x
3. Step 3: Cross multiply
   402,616.50x = 622,605 × 622,605
4. Step 4: Simplify right side
   402,616.50x = 387,636,986,025
5. Step 5: Solve for x
   x = 387,636,986,025/402,616.50
6. Step 6: Final answer
   x = 962,794.58