Finding the Fourth Proportional to 2,559.14, 3,531.76 and 1,440.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.14 : 3,531.76 = 1,440.12 : x
2. Step 2: Convert to fraction form
   2,559.14/3,531.76 = 1,440.12/x
3. Step 3: Cross multiply
   2,559.14x = 3,531.76 × 1,440.12
4. Step 4: Simplify right side
   2,559.14x = 5,086,154.61
5. Step 5: Solve for x
   x = 5,086,154.61/2,559.14
6. Step 6: Final answer
   x = 1,987.45