Finding the Third Proportional to 402,287 and 554,153.50

Step by Step Solution

1. Step 1: Write the proportion equation
   402,287 : 554,153.50 = 554,153.50 : x
2. Step 2: Convert to fraction form
   402,287/554,153.50 = 554,153.50/x
3. Step 3: Cross multiply
   402,287x = 554,153.50 × 554,153.50
4. Step 4: Simplify right side
   402,287x = 307,086,101,562.25
5. Step 5: Solve for x
   x = 307,086,101,562.25/402,287
6. Step 6: Final answer
   x = 763,350.80