Finding the Fourth Proportional to 2,558.75, 3,531.06 and 1,439.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.75 : 3,531.06 = 1,439.69 : x
2. Step 2: Convert to fraction form
   2,558.75/3,531.06 = 1,439.69/x
3. Step 3: Cross multiply
   2,558.75x = 3,531.06 × 1,439.69
4. Step 4: Simplify right side
   2,558.75x = 5,083,614.12
5. Step 5: Solve for x
   x = 5,083,614.12/2,558.75
6. Step 6: Final answer
   x = 1,986.76