Finding the Fourth Proportional to 2,866.57, 4,300.49 and 918.97

Step by Step Solution

1. Step 1: Write the proportion equation
   2,866.57 : 4,300.49 = 918.97 : x
2. Step 2: Convert to fraction form
   2,866.57/4,300.49 = 918.97/x
3. Step 3: Cross multiply
   2,866.57x = 4,300.49 × 918.97
4. Step 4: Simplify right side
   2,866.57x = 3,952,021.30
5. Step 5: Solve for x
   x = 3,952,021.30/2,866.57
6. Step 6: Final answer
   x = 1,378.66