Finding the Fourth Proportional to 102,061.71, 140,829.66 and 56,740.05

Step by Step Solution

1. Step 1: Write the proportion equation
   102,061.71 : 140,829.66 = 56,740.05 : x
2. Step 2: Convert to fraction form
   102,061.71/140,829.66 = 56,740.05/x
3. Step 3: Cross multiply
   102,061.71x = 140,829.66 × 56,740.05
4. Step 4: Simplify right side
   102,061.71x = 7,990,681,949.88
5. Step 5: Solve for x
   x = 7,990,681,949.88/102,061.71
6. Step 6: Final answer
   x = 78,292.65