Finding the Fourth Proportional to 82,728.12, 123,981.48 and 40,543.68

Step by Step Solution

1. Step 1: Write the proportion equation
   82,728.12 : 123,981.48 = 40,543.68 : x
2. Step 2: Convert to fraction form
   82,728.12/123,981.48 = 40,543.68/x
3. Step 3: Cross multiply
   82,728.12x = 123,981.48 × 40,543.68
4. Step 4: Simplify right side
   82,728.12x = 5,026,665,451.05
5. Step 5: Solve for x
   x = 5,026,665,451.05/82,728.12
6. Step 6: Final answer
   x = 60,761.27