Finding the Fourth Proportional to 2,559.85, 3,532.70 and 1,440.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.85 : 3,532.70 = 1,440.79 : x
2. Step 2: Convert to fraction form
   2,559.85/3,532.70 = 1,440.79/x
3. Step 3: Cross multiply
   2,559.85x = 3,532.70 × 1,440.79
4. Step 4: Simplify right side
   2,559.85x = 5,089,878.83
5. Step 5: Solve for x
   x = 5,089,878.83/2,559.85
6. Step 6: Final answer
   x = 1,988.35