Finding the Fourth Proportional to 2,399.49, 3,599.61 and 839.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.49 : 3,599.61 = 839.92 : x
2. Step 2: Convert to fraction form
   2,399.49/3,599.61 = 839.92/x
3. Step 3: Cross multiply
   2,399.49x = 3,599.61 × 839.92
4. Step 4: Simplify right side
   2,399.49x = 3,023,384.43
5. Step 5: Solve for x
   x = 3,023,384.43/2,399.49
6. Step 6: Final answer
   x = 1,260.01