Finding the Fourth Proportional to 2,858.89, 4,285.59 and 909.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,858.89 : 4,285.59 = 909.82 : x
2. Step 2: Convert to fraction form
   2,858.89/4,285.59 = 909.82/x
3. Step 3: Cross multiply
   2,858.89x = 4,285.59 × 909.82
4. Step 4: Simplify right side
   2,858.89x = 3,899,115.49
5. Step 5: Solve for x
   x = 3,899,115.49/2,858.89
6. Step 6: Final answer
   x = 1,363.86