Finding the Fourth Proportional to 2,287.94, 3,431.60 and 728.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.94 : 3,431.60 = 728.10 : x
2. Step 2: Convert to fraction form
   2,287.94/3,431.60 = 728.10/x
3. Step 3: Cross multiply
   2,287.94x = 3,431.60 × 728.10
4. Step 4: Simplify right side
   2,287.94x = 2,498,547.96
5. Step 5: Solve for x
   x = 2,498,547.96/2,287.94
6. Step 6: Final answer
   x = 1,092.05