Finding the Fourth Proportional to 2,766.89, 4,151.15 and 819.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,766.89 : 4,151.15 = 819.15 : x
2. Step 2: Convert to fraction form
   2,766.89/4,151.15 = 819.15/x
3. Step 3: Cross multiply
   2,766.89x = 4,151.15 × 819.15
4. Step 4: Simplify right side
   2,766.89x = 3,400,410.43
5. Step 5: Solve for x
   x = 3,400,410.43/2,766.89
6. Step 6: Final answer
   x = 1,228.97