Finding the Third Proportional to 31,215.38 and 67,418.53

Step by Step Solution

1. Step 1: Write the proportion equation
   31,215.38 : 67,418.53 = 67,418.53 : x
2. Step 2: Convert to fraction form
   31,215.38/67,418.53 = 67,418.53/x
3. Step 3: Cross multiply
   31,215.38x = 67,418.53 × 67,418.53
4. Step 4: Simplify right side
   31,215.38x = 4,545,258,355.91
5. Step 5: Solve for x
   x = 4,545,258,355.91/31,215.38
6. Step 6: Final answer
   x = 145,609.60