Finding the Fourth Proportional to 2,857.69, 4,285.83 and 909.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,857.69 : 4,285.83 = 909.46 : x
2. Step 2: Convert to fraction form
   2,857.69/4,285.83 = 909.46/x
3. Step 3: Cross multiply
   2,857.69x = 4,285.83 × 909.46
4. Step 4: Simplify right side
   2,857.69x = 3,897,790.95
5. Step 5: Solve for x
   x = 3,897,790.95/2,857.69
6. Step 6: Final answer
   x = 1,363.97