Finding the Fourth Proportional to 2,858.28, 4,287.72 and 910.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,858.28 : 4,287.72 = 910.03 : x
2. Step 2: Convert to fraction form
   2,858.28/4,287.72 = 910.03/x
3. Step 3: Cross multiply
   2,858.28x = 4,287.72 × 910.03
4. Step 4: Simplify right side
   2,858.28x = 3,901,932.39
5. Step 5: Solve for x
   x = 3,901,932.39/2,858.28
6. Step 6: Final answer
   x = 1,365.14