Finding the Fourth Proportional to 2,840.16, 4,260.72 and 1,280.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,840.16 : 4,260.72 = 1,280.18 : x
2. Step 2: Convert to fraction form
   2,840.16/4,260.72 = 1,280.18/x
3. Step 3: Cross multiply
   2,840.16x = 4,260.72 × 1,280.18
4. Step 4: Simplify right side
   2,840.16x = 5,454,467.23
5. Step 5: Solve for x
   x = 5,454,467.23/2,840.16
6. Step 6: Final answer
   x = 1,920.48