Finding the Third Proportional to 139,435 and 215,448

Step by Step Solution

1. Step 1: Write the proportion equation
   139,435 : 215,448 = 215,448 : x
2. Step 2: Convert to fraction form
   139,435/215,448 = 215,448/x
3. Step 3: Cross multiply
   139,435x = 215,448 × 215,448
4. Step 4: Simplify right side
   139,435x = 46,417,840,704
5. Step 5: Solve for x
   x = 46,417,840,704/139,435
6. Step 6: Final answer
   x = 332,899.49