Finding the Fourth Proportional to 105,434.16, 145,498.91 and 57,687.41

Step by Step Solution

1. Step 1: Write the proportion equation
   105,434.16 : 145,498.91 = 57,687.41 : x
2. Step 2: Convert to fraction form
   105,434.16/145,498.91 = 57,687.41/x
3. Step 3: Cross multiply
   105,434.16x = 145,498.91 × 57,687.41
4. Step 4: Simplify right side
   105,434.16x = 8,393,454,259.79
5. Step 5: Solve for x
   x = 8,393,454,259.79/105,434.16
6. Step 6: Final answer
   x = 79,608.49