Finding the Fourth Proportional to 2,855.84, 4,280.78 and 1,392.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,855.84 : 4,280.78 = 1,392.98 : x
2. Step 2: Convert to fraction form
   2,855.84/4,280.78 = 1,392.98/x
3. Step 3: Cross multiply
   2,855.84x = 4,280.78 × 1,392.98
4. Step 4: Simplify right side
   2,855.84x = 5,963,040.92
5. Step 5: Solve for x
   x = 5,963,040.92/2,855.84
6. Step 6: Final answer
   x = 2,088.02