Finding the Fourth Proportional to 2,857.89, 4,286.67 and 909.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,857.89 : 4,286.67 = 909.84 : x
2. Step 2: Convert to fraction form
   2,857.89/4,286.67 = 909.84/x
3. Step 3: Cross multiply
   2,857.89x = 4,286.67 × 909.84
4. Step 4: Simplify right side
   2,857.89x = 3,900,183.83
5. Step 5: Solve for x
   x = 3,900,183.83/2,857.89
6. Step 6: Final answer
   x = 1,364.71