Finding the Third Proportional to 31,605.75 and 67,108.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,605.75 : 67,108.50 = 67,108.50 : x
2. Step 2: Convert to fraction form
   31,605.75/67,108.50 = 67,108.50/x
3. Step 3: Cross multiply
   31,605.75x = 67,108.50 × 67,108.50
4. Step 4: Simplify right side
   31,605.75x = 4,503,550,772.25
5. Step 5: Solve for x
   x = 4,503,550,772.25/31,605.75
6. Step 6: Final answer
   x = 142,491.50