Finding the Fourth Proportional to 2,558.71, 3,531.15 and 1,439.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.71 : 3,531.15 = 1,439.83 : x
2. Step 2: Convert to fraction form
   2,558.71/3,531.15 = 1,439.83/x
3. Step 3: Cross multiply
   2,558.71x = 3,531.15 × 1,439.83
4. Step 4: Simplify right side
   2,558.71x = 5,084,255.70
5. Step 5: Solve for x
   x = 5,084,255.70/2,558.71
6. Step 6: Final answer
   x = 1,987.04