Finding the Fourth Proportional to 2,866.50, 4,300.38 and 918.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,866.50 : 4,300.38 = 918.71 : x
2. Step 2: Convert to fraction form
   2,866.50/4,300.38 = 918.71/x
3. Step 3: Cross multiply
   2,866.50x = 4,300.38 × 918.71
4. Step 4: Simplify right side
   2,866.50x = 3,950,780.61
5. Step 5: Solve for x
   x = 3,950,780.61/2,866.50
6. Step 6: Final answer
   x = 1,378.26