Finding the Fourth Proportional to 3,498.39, 5,247.57 and 2,399.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,498.39 : 5,247.57 = 2,399.40 : x
2. Step 2: Convert to fraction form
   3,498.39/5,247.57 = 2,399.40/x
3. Step 3: Cross multiply
   3,498.39x = 5,247.57 × 2,399.40
4. Step 4: Simplify right side
   3,498.39x = 12,591,019.46
5. Step 5: Solve for x
   x = 12,591,019.46/3,498.39
6. Step 6: Final answer
   x = 3,599.09