Finding the Fourth Proportional to 105,280.29, 145,288.76 and 57,536.73

Step by Step Solution

1. Step 1: Write the proportion equation
   105,280.29 : 145,288.76 = 57,536.73 : x
2. Step 2: Convert to fraction form
   105,280.29/145,288.76 = 57,536.73/x
3. Step 3: Cross multiply
   105,280.29x = 145,288.76 × 57,536.73
4. Step 4: Simplify right side
   105,280.29x = 8,359,439,868.47
5. Step 5: Solve for x
   x = 8,359,439,868.47/105,280.29
6. Step 6: Final answer
   x = 79,401.76