Finding the Fourth Proportional to 2,559.81, 3,531.93 and 1,440.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.81 : 3,531.93 = 1,440.53 : x
2. Step 2: Convert to fraction form
   2,559.81/3,531.93 = 1,440.53/x
3. Step 3: Cross multiply
   2,559.81x = 3,531.93 × 1,440.53
4. Step 4: Simplify right side
   2,559.81x = 5,087,851.12
5. Step 5: Solve for x
   x = 5,087,851.12/2,559.81
6. Step 6: Final answer
   x = 1,987.59