Finding the Fourth Proportional to 102,042.79, 140,809.39 and 56,715.39

Step by Step Solution

1. Step 1: Write the proportion equation
   102,042.79 : 140,809.39 = 56,715.39 : x
2. Step 2: Convert to fraction form
   102,042.79/140,809.39 = 56,715.39/x
3. Step 3: Cross multiply
   102,042.79x = 140,809.39 × 56,715.39
4. Step 4: Simplify right side
   102,042.79x = 7,986,059,327.72
5. Step 5: Solve for x
   x = 7,986,059,327.72/102,042.79
6. Step 6: Final answer
   x = 78,261.87