Finding the Fourth Proportional to 2,619.15, 3,614.46 and 1,440.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,619.15 : 3,614.46 = 1,440.20 : x
2. Step 2: Convert to fraction form
   2,619.15/3,614.46 = 1,440.20/x
3. Step 3: Cross multiply
   2,619.15x = 3,614.46 × 1,440.20
4. Step 4: Simplify right side
   2,619.15x = 5,205,527.22
5. Step 5: Solve for x
   x = 5,205,527.22/2,619.15
6. Step 6: Final answer
   x = 1,987.49