Finding the Fourth Proportional to 2,858.16, 4,287.72 and 910.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,858.16 : 4,287.72 = 910.80 : x
2. Step 2: Convert to fraction form
   2,858.16/4,287.72 = 910.80/x
3. Step 3: Cross multiply
   2,858.16x = 4,287.72 × 910.80
4. Step 4: Simplify right side
   2,858.16x = 3,905,255.38
5. Step 5: Solve for x
   x = 3,905,255.38/2,858.16
6. Step 6: Final answer
   x = 1,366.35