Finding the Third Proportional to 31,243.88 and 67,478.25

Step by Step Solution

1. Step 1: Write the proportion equation
   31,243.88 : 67,478.25 = 67,478.25 : x
2. Step 2: Convert to fraction form
   31,243.88/67,478.25 = 67,478.25/x
3. Step 3: Cross multiply
   31,243.88x = 67,478.25 × 67,478.25
4. Step 4: Simplify right side
   31,243.88x = 4,553,314,223.06
5. Step 5: Solve for x
   x = 4,553,314,223.06/31,243.88
6. Step 6: Final answer
   x = 145,734.62