Finding the Fourth Proportional to 9,086.72, 12,540.83 and 5,311.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,086.72 : 12,540.83 = 5,311.91 : x
2. Step 2: Convert to fraction form
   9,086.72/12,540.83 = 5,311.91/x
3. Step 3: Cross multiply
   9,086.72x = 12,540.83 × 5,311.91
4. Step 4: Simplify right side
   9,086.72x = 66,615,765.08
5. Step 5: Solve for x
   x = 66,615,765.08/9,086.72
6. Step 6: Final answer
   x = 7,331.12