Finding the Fourth Proportional to 2,866.23, 4,300.16 and 918.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,866.23 : 4,300.16 = 918.57 : x
2. Step 2: Convert to fraction form
   2,866.23/4,300.16 = 918.57/x
3. Step 3: Cross multiply
   2,866.23x = 4,300.16 × 918.57
4. Step 4: Simplify right side
   2,866.23x = 3,949,993.38
5. Step 5: Solve for x
   x = 3,949,993.38/2,866.23
6. Step 6: Final answer
   x = 1,378.11