Finding the Third Proportional to 31,560 and 68,520

Step by Step Solution

1. Step 1: Write the proportion equation
   31,560 : 68,520 = 68,520 : x
2. Step 2: Convert to fraction form
   31,560/68,520 = 68,520/x
3. Step 3: Cross multiply
   31,560x = 68,520 × 68,520
4. Step 4: Simplify right side
   31,560x = 4,694,990,400
5. Step 5: Solve for x
   x = 4,694,990,400/31,560
6. Step 6: Final answer
   x = 148,763.95