Finding the Fourth Proportional to 2,550.72, 3,826.20 and 819.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,550.72 : 3,826.20 = 819.36 : x
2. Step 2: Convert to fraction form
   2,550.72/3,826.20 = 819.36/x
3. Step 3: Cross multiply
   2,550.72x = 3,826.20 × 819.36
4. Step 4: Simplify right side
   2,550.72x = 3,135,035.23
5. Step 5: Solve for x
   x = 3,135,035.23/2,550.72
6. Step 6: Final answer
   x = 1,229.08