Finding the Fourth Proportional to 2,558.24, 3,530.24 and 1,439.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.24 : 3,530.24 = 1,439.20 : x
2. Step 2: Convert to fraction form
   2,558.24/3,530.24 = 1,439.20/x
3. Step 3: Cross multiply
   2,558.24x = 3,530.24 × 1,439.20
4. Step 4: Simplify right side
   2,558.24x = 5,080,721.41
5. Step 5: Solve for x
   x = 5,080,721.41/2,558.24
6. Step 6: Final answer
   x = 1,986.02