Finding the Third Proportional to 402,272 and 554,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   402,272 : 554,131.50 = 554,131.50 : x
2. Step 2: Convert to fraction form
   402,272/554,131.50 = 554,131.50/x
3. Step 3: Cross multiply
   402,272x = 554,131.50 × 554,131.50
4. Step 4: Simplify right side
   402,272x = 307,061,719,292.25
5. Step 5: Solve for x
   x = 307,061,719,292.25/402,272
6. Step 6: Final answer
   x = 763,318.65