Finding the Fourth Proportional to 11,099.20, 16,656.72 and 5,257.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,099.20 : 16,656.72 = 5,257.12 : x
2. Step 2: Convert to fraction form
   11,099.20/16,656.72 = 5,257.12/x
3. Step 3: Cross multiply
   11,099.20x = 16,656.72 × 5,257.12
4. Step 4: Simplify right side
   11,099.20x = 87,566,375.85
5. Step 5: Solve for x
   x = 87,566,375.85/11,099.20
6. Step 6: Final answer
   x = 7,889.43