Finding the Fourth Proportional to 105,285.29, 145,303.72 and 57,545.82

Step by Step Solution

1. Step 1: Write the proportion equation
   105,285.29 : 145,303.72 = 57,545.82 : x
2. Step 2: Convert to fraction form
   105,285.29/145,303.72 = 57,545.82/x
3. Step 3: Cross multiply
   105,285.29x = 145,303.72 × 57,545.82
4. Step 4: Simplify right side
   105,285.29x = 8,361,621,487.61
5. Step 5: Solve for x
   x = 8,361,621,487.61/105,285.29
6. Step 6: Final answer
   x = 79,418.70