Finding the Fourth Proportional to 2,550.40, 3,826.88 and 819.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,550.40 : 3,826.88 = 819.84 : x
2. Step 2: Convert to fraction form
   2,550.40/3,826.88 = 819.84/x
3. Step 3: Cross multiply
   2,550.40x = 3,826.88 × 819.84
4. Step 4: Simplify right side
   2,550.40x = 3,137,429.30
5. Step 5: Solve for x
   x = 3,137,429.30/2,550.40
6. Step 6: Final answer
   x = 1,230.17