Finding the Fourth Proportional to 2,105.19, 3,158.33 and 806.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.19 : 3,158.33 = 806.76 : x
2. Step 2: Convert to fraction form
   2,105.19/3,158.33 = 806.76/x
3. Step 3: Cross multiply
   2,105.19x = 3,158.33 × 806.76
4. Step 4: Simplify right side
   2,105.19x = 2,548,010.28
5. Step 5: Solve for x
   x = 2,548,010.28/2,105.19
6. Step 6: Final answer
   x = 1,210.35