Finding the Third Proportional to 31,717.50 and 68,902.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,717.50 : 68,902.50 = 68,902.50 : x
2. Step 2: Convert to fraction form
   31,717.50/68,902.50 = 68,902.50/x
3. Step 3: Cross multiply
   31,717.50x = 68,902.50 × 68,902.50
4. Step 4: Simplify right side
   31,717.50x = 4,747,554,506.25
5. Step 5: Solve for x
   x = 4,747,554,506.25/31,717.50
6. Step 6: Final answer
   x = 149,682.49