Finding the Fourth Proportional to 105,472.41, 145,552.16 and 57,728.82

Step by Step Solution

1. Step 1: Write the proportion equation
   105,472.41 : 145,552.16 = 57,728.82 : x
2. Step 2: Convert to fraction form
   105,472.41/145,552.16 = 57,728.82/x
3. Step 3: Cross multiply
   105,472.41x = 145,552.16 × 57,728.82
4. Step 4: Simplify right side
   105,472.41x = 8,402,554,445.25
5. Step 5: Solve for x
   x = 8,402,554,445.25/105,472.41
6. Step 6: Final answer
   x = 79,665.90