Finding the Third Proportional to 402,291 and 554,160.50

Step by Step Solution

1. Step 1: Write the proportion equation
   402,291 : 554,160.50 = 554,160.50 : x
2. Step 2: Convert to fraction form
   402,291/554,160.50 = 554,160.50/x
3. Step 3: Cross multiply
   402,291x = 554,160.50 × 554,160.50
4. Step 4: Simplify right side
   402,291x = 307,093,859,760.25
5. Step 5: Solve for x
   x = 307,093,859,760.25/402,291
6. Step 6: Final answer
   x = 763,362.49