Finding the Fourth Proportional to 2,559.11, 3,531.55 and 1,440.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.11 : 3,531.55 = 1,440.06 : x
2. Step 2: Convert to fraction form
   2,559.11/3,531.55 = 1,440.06/x
3. Step 3: Cross multiply
   2,559.11x = 3,531.55 × 1,440.06
4. Step 4: Simplify right side
   2,559.11x = 5,085,643.89
5. Step 5: Solve for x
   x = 5,085,643.89/2,559.11
6. Step 6: Final answer
   x = 1,987.27