Finding the Third Proportional to 139,028 and 215,452

Step by Step Solution

1. Step 1: Write the proportion equation
   139,028 : 215,452 = 215,452 : x
2. Step 2: Convert to fraction form
   139,028/215,452 = 215,452/x
3. Step 3: Cross multiply
   139,028x = 215,452 × 215,452
4. Step 4: Simplify right side
   139,028x = 46,419,564,304
5. Step 5: Solve for x
   x = 46,419,564,304/139,028
6. Step 6: Final answer
   x = 333,886.44