Finding the Fourth Proportional to 2,558.83, 3,531.37 and 1,439.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.83 : 3,531.37 = 1,439.88 : x
2. Step 2: Convert to fraction form
   2,558.83/3,531.37 = 1,439.88/x
3. Step 3: Cross multiply
   2,558.83x = 3,531.37 × 1,439.88
4. Step 4: Simplify right side
   2,558.83x = 5,084,749.04
5. Step 5: Solve for x
   x = 5,084,749.04/2,558.83
6. Step 6: Final answer
   x = 1,987.14