Finding the Third Proportional to 139,414 and 215,419

Step by Step Solution

1. Step 1: Write the proportion equation
   139,414 : 215,419 = 215,419 : x
2. Step 2: Convert to fraction form
   139,414/215,419 = 215,419/x
3. Step 3: Cross multiply
   139,414x = 215,419 × 215,419
4. Step 4: Simplify right side
   139,414x = 46,405,345,561
5. Step 5: Solve for x
   x = 46,405,345,561/139,414
6. Step 6: Final answer
   x = 332,860.01