Finding the Fourth Proportional to 2,857.25, 3,940.31 and 1,863.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,857.25 : 3,940.31 = 1,863.29 : x
2. Step 2: Convert to fraction form
   2,857.25/3,940.31 = 1,863.29/x
3. Step 3: Cross multiply
   2,857.25x = 3,940.31 × 1,863.29
4. Step 4: Simplify right side
   2,857.25x = 7,341,930.90
5. Step 5: Solve for x
   x = 7,341,930.90/2,857.25
6. Step 6: Final answer
   x = 2,569.58