Finding the Fourth Proportional to 102,020.46, 140,784.86 and 56,080.25

Step by Step Solution

1. Step 1: Write the proportion equation
   102,020.46 : 140,784.86 = 56,080.25 : x
2. Step 2: Convert to fraction form
   102,020.46/140,784.86 = 56,080.25/x
3. Step 3: Cross multiply
   102,020.46x = 140,784.86 × 56,080.25
4. Step 4: Simplify right side
   102,020.46x = 7,895,249,160.69
5. Step 5: Solve for x
   x = 7,895,249,160.69/102,020.46
6. Step 6: Final answer
   x = 77,388.88