Finding the Fourth Proportional to 9,168.56, 12,651.88 and 5,391.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,168.56 : 12,651.88 = 5,391.88 : x
2. Step 2: Convert to fraction form
   9,168.56/12,651.88 = 5,391.88/x
3. Step 3: Cross multiply
   9,168.56x = 12,651.88 × 5,391.88
4. Step 4: Simplify right side
   9,168.56x = 68,217,418.73
5. Step 5: Solve for x
   x = 68,217,418.73/9,168.56
6. Step 6: Final answer
   x = 7,440.36