Finding the Fourth Proportional to 105,520.98, 145,617.67 and 57,773.31

Step by Step Solution

1. Step 1: Write the proportion equation
   105,520.98 : 145,617.67 = 57,773.31 : x
2. Step 2: Convert to fraction form
   105,520.98/145,617.67 = 57,773.31/x
3. Step 3: Cross multiply
   105,520.98x = 145,617.67 × 57,773.31
4. Step 4: Simplify right side
   105,520.98x = 8,412,814,790.39
5. Step 5: Solve for x
   x = 8,412,814,790.39/105,520.98
6. Step 6: Final answer
   x = 79,726.47