Finding the Fourth Proportional to 8,118.15, 12,179.34 and 2,571.57

Step by Step Solution

1. Step 1: Write the proportion equation
   8,118.15 : 12,179.34 = 2,571.57 : x
2. Step 2: Convert to fraction form
   8,118.15/12,179.34 = 2,571.57/x
3. Step 3: Cross multiply
   8,118.15x = 12,179.34 × 2,571.57
4. Step 4: Simplify right side
   8,118.15x = 31,320,025.36
5. Step 5: Solve for x
   x = 31,320,025.36/8,118.15
6. Step 6: Final answer
   x = 3,858.02