Finding the Fourth Proportional to 3,892.20, 5,371.20 and 2,399.52

Step by Step Solution

1. Step 1: Write the proportion equation
   3,892.20 : 5,371.20 = 2,399.52 : x
2. Step 2: Convert to fraction form
   3,892.20/5,371.20 = 2,399.52/x
3. Step 3: Cross multiply
   3,892.20x = 5,371.20 × 2,399.52
4. Step 4: Simplify right side
   3,892.20x = 12,888,301.82
5. Step 5: Solve for x
   x = 12,888,301.82/3,892.20
6. Step 6: Final answer
   x = 3,311.32