Finding the Fourth Proportional to 2,856.40, 4,283.69 and 908.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,856.40 : 4,283.69 = 908.15 : x
2. Step 2: Convert to fraction form
   2,856.40/4,283.69 = 908.15/x
3. Step 3: Cross multiply
   2,856.40x = 4,283.69 × 908.15
4. Step 4: Simplify right side
   2,856.40x = 3,890,223.18
5. Step 5: Solve for x
   x = 3,890,223.18/2,856.40
6. Step 6: Final answer
   x = 1,361.93