Finding the Fourth Proportional to 2,559.08, 3,531.72 and 1,440.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.08 : 3,531.72 = 1,440.20 : x
2. Step 2: Convert to fraction form
   2,559.08/3,531.72 = 1,440.20/x
3. Step 3: Cross multiply
   2,559.08x = 3,531.72 × 1,440.20
4. Step 4: Simplify right side
   2,559.08x = 5,086,383.14
5. Step 5: Solve for x
   x = 5,086,383.14/2,559.08
6. Step 6: Final answer
   x = 1,987.58