Finding the Fourth Proportional to 2,559.80, 3,532.61 and 1,440.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.80 : 3,532.61 = 1,440.72 : x
2. Step 2: Convert to fraction form
   2,559.80/3,532.61 = 1,440.72/x
3. Step 3: Cross multiply
   2,559.80x = 3,532.61 × 1,440.72
4. Step 4: Simplify right side
   2,559.80x = 5,089,505.48
5. Step 5: Solve for x
   x = 5,089,505.48/2,559.80
6. Step 6: Final answer
   x = 1,988.24