Finding the Third Proportional to 243,141 and 390,658.50

Step by Step Solution

1. Step 1: Write the proportion equation
   243,141 : 390,658.50 = 390,658.50 : x
2. Step 2: Convert to fraction form
   243,141/390,658.50 = 390,658.50/x
3. Step 3: Cross multiply
   243,141x = 390,658.50 × 390,658.50
4. Step 4: Simplify right side
   243,141x = 152,614,063,622.25
5. Step 5: Solve for x
   x = 152,614,063,622.25/243,141
6. Step 6: Final answer
   x = 627,677.21