Finding the Third Proportional to 243,666 and 365,499

Step by Step Solution

1. Step 1: Write the proportion equation
   243,666 : 365,499 = 365,499 : x
2. Step 2: Convert to fraction form
   243,666/365,499 = 365,499/x
3. Step 3: Cross multiply
   243,666x = 365,499 × 365,499
4. Step 4: Simplify right side
   243,666x = 133,589,519,001
5. Step 5: Solve for x
   x = 133,589,519,001/243,666
6. Step 6: Final answer
   x = 548,248.50