Finding the Third Proportional to 31,989.50 and 67,670

Step by Step Solution

1. Step 1: Write the proportion equation
   31,989.50 : 67,670 = 67,670 : x
2. Step 2: Convert to fraction form
   31,989.50/67,670 = 67,670/x
3. Step 3: Cross multiply
   31,989.50x = 67,670 × 67,670
4. Step 4: Simplify right side
   31,989.50x = 4,579,228,900
5. Step 5: Solve for x
   x = 4,579,228,900/31,989.50
6. Step 6: Final answer
   x = 143,147.87