Finding the Fourth Proportional to 2,856.93, 4,285.82 and 909.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,856.93 : 4,285.82 = 909.57 : x
2. Step 2: Convert to fraction form
   2,856.93/4,285.82 = 909.57/x
3. Step 3: Cross multiply
   2,856.93x = 4,285.82 × 909.57
4. Step 4: Simplify right side
   2,856.93x = 3,898,227.32
5. Step 5: Solve for x
   x = 3,898,227.32/2,856.93
6. Step 6: Final answer
   x = 1,364.48