Finding the Fourth Proportional to 2,587.20, 3,880.72 and 1,440.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,587.20 : 3,880.72 = 1,440.24 : x
2. Step 2: Convert to fraction form
   2,587.20/3,880.72 = 1,440.24/x
3. Step 3: Cross multiply
   2,587.20x = 3,880.72 × 1,440.24
4. Step 4: Simplify right side
   2,587.20x = 5,589,168.17
5. Step 5: Solve for x
   x = 5,589,168.17/2,587.20
6. Step 6: Final answer
   x = 2,160.32