Finding the Fourth Proportional to 100,760.78, 139,069.76 and 57,769.15

Step by Step Solution

1. Step 1: Write the proportion equation
   100,760.78 : 139,069.76 = 57,769.15 : x
2. Step 2: Convert to fraction form
   100,760.78/139,069.76 = 57,769.15/x
3. Step 3: Cross multiply
   100,760.78x = 139,069.76 × 57,769.15
4. Step 4: Simplify right side
   100,760.78x = 8,033,941,825.90
5. Step 5: Solve for x
   x = 8,033,941,825.90/100,760.78
6. Step 6: Final answer
   x = 79,732.83