Finding the Fourth Proportional to 102,080.79, 140,877.86 and 56,768.90

Step by Step Solution

1. Step 1: Write the proportion equation
   102,080.79 : 140,877.86 = 56,768.90 : x
2. Step 2: Convert to fraction form
   102,080.79/140,877.86 = 56,768.90/x
3. Step 3: Cross multiply
   102,080.79x = 140,877.86 × 56,768.90
4. Step 4: Simplify right side
   102,080.79x = 7,997,480,158.32
5. Step 5: Solve for x
   x = 7,997,480,158.32/102,080.79
6. Step 6: Final answer
   x = 78,344.61