Finding the Third Proportional to 31,398 and 68,700

Step by Step Solution

1. Step 1: Write the proportion equation
   31,398 : 68,700 = 68,700 : x
2. Step 2: Convert to fraction form
   31,398/68,700 = 68,700/x
3. Step 3: Cross multiply
   31,398x = 68,700 × 68,700
4. Step 4: Simplify right side
   31,398x = 4,719,690,000
5. Step 5: Solve for x
   x = 4,719,690,000/31,398
6. Step 6: Final answer
   x = 150,318.17