Finding the Fourth Proportional to 8,118.56, 12,178.18 and 2,571.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,118.56 : 12,178.18 = 2,571.78 : x
2. Step 2: Convert to fraction form
   8,118.56/12,178.18 = 2,571.78/x
3. Step 3: Cross multiply
   8,118.56x = 12,178.18 × 2,571.78
4. Step 4: Simplify right side
   8,118.56x = 31,319,597.27
5. Step 5: Solve for x
   x = 31,319,597.27/8,118.56
6. Step 6: Final answer
   x = 3,857.78