Finding the Fourth Proportional to 2,838.50, 4,257.72 and 890.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,838.50 : 4,257.72 = 890.84 : x
2. Step 2: Convert to fraction form
   2,838.50/4,257.72 = 890.84/x
3. Step 3: Cross multiply
   2,838.50x = 4,257.72 × 890.84
4. Step 4: Simplify right side
   2,838.50x = 3,792,947.28
5. Step 5: Solve for x
   x = 3,792,947.28/2,838.50
6. Step 6: Final answer
   x = 1,336.25