Finding the Fourth Proportional to 9,087.20, 12,540.30 and 5,549.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,087.20 : 12,540.30 = 5,549.72 : x
2. Step 2: Convert to fraction form
   9,087.20/12,540.30 = 5,549.72/x
3. Step 3: Cross multiply
   9,087.20x = 12,540.30 × 5,549.72
4. Step 4: Simplify right side
   9,087.20x = 69,595,153.72
5. Step 5: Solve for x
   x = 69,595,153.72/9,087.20
6. Step 6: Final answer
   x = 7,658.59