Finding the Third Proportional to 139,437 and 215,451

Step by Step Solution

1. Step 1: Write the proportion equation
   139,437 : 215,451 = 215,451 : x
2. Step 2: Convert to fraction form
   139,437/215,451 = 215,451/x
3. Step 3: Cross multiply
   139,437x = 215,451 × 215,451
4. Step 4: Simplify right side
   139,437x = 46,419,133,401
5. Step 5: Solve for x
   x = 46,419,133,401/139,437
6. Step 6: Final answer
   x = 332,903.99