Finding the Fourth Proportional to 2,819.50, 4,229.88 and 845.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,819.50 : 4,229.88 = 845.05 : x
2. Step 2: Convert to fraction form
   2,819.50/4,229.88 = 845.05/x
3. Step 3: Cross multiply
   2,819.50x = 4,229.88 × 845.05
4. Step 4: Simplify right side
   2,819.50x = 3,574,460.09
5. Step 5: Solve for x
   x = 3,574,460.09/2,819.50
6. Step 6: Final answer
   x = 1,267.76