Finding the Fourth Proportional to 9,086.72, 12,540.12 and 5,549.36

Step by Step Solution

1. Step 1: Write the proportion equation
   9,086.72 : 12,540.12 = 5,549.36 : x
2. Step 2: Convert to fraction form
   9,086.72/12,540.12 = 5,549.36/x
3. Step 3: Cross multiply
   9,086.72x = 12,540.12 × 5,549.36
4. Step 4: Simplify right side
   9,086.72x = 69,589,640.32
5. Step 5: Solve for x
   x = 69,589,640.32/9,086.72
6. Step 6: Final answer
   x = 7,658.39