Finding the Fourth Proportional to 3,920.22, 5,421.92 and 3,854.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,920.22 : 5,421.92 = 3,854.61 : x
2. Step 2: Convert to fraction form
   3,920.22/5,421.92 = 3,854.61/x
3. Step 3: Cross multiply
   3,920.22x = 5,421.92 × 3,854.61
4. Step 4: Simplify right side
   3,920.22x = 20,899,367.78
5. Step 5: Solve for x
   x = 20,899,367.78/3,920.22
6. Step 6: Final answer
   x = 5,331.17