Finding the Third Proportional to 31,664 and 67,720

Step by Step Solution

1. Step 1: Write the proportion equation
   31,664 : 67,720 = 67,720 : x
2. Step 2: Convert to fraction form
   31,664/67,720 = 67,720/x
3. Step 3: Cross multiply
   31,664x = 67,720 × 67,720
4. Step 4: Simplify right side
   31,664x = 4,585,998,400
5. Step 5: Solve for x
   x = 4,585,998,400/31,664
6. Step 6: Final answer
   x = 144,833.20