Finding the Fourth Proportional to 102,081.64, 140,870.02 and 56,757.28

Step by Step Solution

1. Step 1: Write the proportion equation
   102,081.64 : 140,870.02 = 56,757.28 : x
2. Step 2: Convert to fraction form
   102,081.64/140,870.02 = 56,757.28/x
3. Step 3: Cross multiply
   102,081.64x = 140,870.02 × 56,757.28
4. Step 4: Simplify right side
   102,081.64x = 7,995,399,168.75
5. Step 5: Solve for x
   x = 7,995,399,168.75/102,081.64
6. Step 6: Final answer
   x = 78,323.58