Finding the Fourth Proportional to 2,858.55, 4,287.81 and 910.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,858.55 : 4,287.81 = 910.71 : x
2. Step 2: Convert to fraction form
   2,858.55/4,287.81 = 910.71/x
3. Step 3: Cross multiply
   2,858.55x = 4,287.81 × 910.71
4. Step 4: Simplify right side
   2,858.55x = 3,904,951.45
5. Step 5: Solve for x
   x = 3,904,951.45/2,858.55
6. Step 6: Final answer
   x = 1,366.06