Finding the Fourth Proportional to 3,891.27, 5,369.77 and 2,399.32

Step by Step Solution

1. Step 1: Write the proportion equation
   3,891.27 : 5,369.77 = 2,399.32 : x
2. Step 2: Convert to fraction form
   3,891.27/5,369.77 = 2,399.32/x
3. Step 3: Cross multiply
   3,891.27x = 5,369.77 × 2,399.32
4. Step 4: Simplify right side
   3,891.27x = 12,883,799.52
5. Step 5: Solve for x
   x = 12,883,799.52/3,891.27
6. Step 6: Final answer
   x = 3,310.95