Finding the Fourth Proportional to 3,630.72, 5,443.20 and 1,440

Step by Step Solution

1. Step 1: Write the proportion equation
   3,630.72 : 5,443.20 = 1,440 : x
2. Step 2: Convert to fraction form
   3,630.72/5,443.20 = 1,440/x
3. Step 3: Cross multiply
   3,630.72x = 5,443.20 × 1,440
4. Step 4: Simplify right side
   3,630.72x = 7,838,208
5. Step 5: Solve for x
   x = 7,838,208/3,630.72
6. Step 6: Final answer
   x = 2,158.86