Finding the Fourth Proportional to 2,854.86, 4,280.67 and 1,392.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,854.86 : 4,280.67 = 1,392.18 : x
2. Step 2: Convert to fraction form
   2,854.86/4,280.67 = 1,392.18/x
3. Step 3: Cross multiply
   2,854.86x = 4,280.67 × 1,392.18
4. Step 4: Simplify right side
   2,854.86x = 5,959,463.16
5. Step 5: Solve for x
   x = 5,959,463.16/2,854.86
6. Step 6: Final answer
   x = 2,087.48