Finding the Fourth Proportional to 2,559.31, 3,531.24 and 1,440.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.31 : 3,531.24 = 1,440.03 : x
2. Step 2: Convert to fraction form
   2,559.31/3,531.24 = 1,440.03/x
3. Step 3: Cross multiply
   2,559.31x = 3,531.24 × 1,440.03
4. Step 4: Simplify right side
   2,559.31x = 5,085,091.54
5. Step 5: Solve for x
   x = 5,085,091.54/2,559.31
6. Step 6: Final answer
   x = 1,986.90