Finding the Fourth Proportional to 105,552.72, 145,662.98 and 57,155.18

Step by Step Solution

1. Step 1: Write the proportion equation
   105,552.72 : 145,662.98 = 57,155.18 : x
2. Step 2: Convert to fraction form
   105,552.72/145,662.98 = 57,155.18/x
3. Step 3: Cross multiply
   105,552.72x = 145,662.98 × 57,155.18
4. Step 4: Simplify right side
   105,552.72x = 8,325,392,827.15
5. Step 5: Solve for x
   x = 8,325,392,827.15/105,552.72
6. Step 6: Final answer
   x = 78,874.26