Finding the Fourth Proportional to 102,080.34, 140,867.17 and 56,139.59

Step by Step Solution

1. Step 1: Write the proportion equation
   102,080.34 : 140,867.17 = 56,139.59 : x
2. Step 2: Convert to fraction form
   102,080.34/140,867.17 = 56,139.59/x
3. Step 3: Cross multiply
   102,080.34x = 140,867.17 × 56,139.59
4. Step 4: Simplify right side
   102,080.34x = 7,908,225,168.26
5. Step 5: Solve for x
   x = 7,908,225,168.26/102,080.34
6. Step 6: Final answer
   x = 77,470.60