Finding the Fourth Proportional to 105,156.18, 145,117.72 and 57,411.54

Step by Step Solution

1. Step 1: Write the proportion equation
   105,156.18 : 145,117.72 = 57,411.54 : x
2. Step 2: Convert to fraction form
   105,156.18/145,117.72 = 57,411.54/x
3. Step 3: Cross multiply
   105,156.18x = 145,117.72 × 57,411.54
4. Step 4: Simplify right side
   105,156.18x = 8,331,431,786.49
5. Step 5: Solve for x
   x = 8,331,431,786.49/105,156.18
6. Step 6: Final answer
   x = 79,229.12