Finding the Fourth Proportional to 3,909.72, 5,395.27 and 2,231.67

Step by Step Solution

1. Step 1: Write the proportion equation
   3,909.72 : 5,395.27 = 2,231.67 : x
2. Step 2: Convert to fraction form
   3,909.72/5,395.27 = 2,231.67/x
3. Step 3: Cross multiply
   3,909.72x = 5,395.27 × 2,231.67
4. Step 4: Simplify right side
   3,909.72x = 12,040,462.20
5. Step 5: Solve for x
   x = 12,040,462.20/3,909.72
6. Step 6: Final answer
   x = 3,079.62