Finding the Fourth Proportional to 2,559.18, 3,531.54 and 1,440.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.18 : 3,531.54 = 1,440.30 : x
2. Step 2: Convert to fraction form
   2,559.18/3,531.54 = 1,440.30/x
3. Step 3: Cross multiply
   2,559.18x = 3,531.54 × 1,440.30
4. Step 4: Simplify right side
   2,559.18x = 5,086,477.06
5. Step 5: Solve for x
   x = 5,086,477.06/2,559.18
6. Step 6: Final answer
   x = 1,987.54