Finding the Fourth Proportional to 2,379.78, 3,568.86 and 819.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,379.78 : 3,568.86 = 819.18 : x
2. Step 2: Convert to fraction form
   2,379.78/3,568.86 = 819.18/x
3. Step 3: Cross multiply
   2,379.78x = 3,568.86 × 819.18
4. Step 4: Simplify right side
   2,379.78x = 2,923,538.73
5. Step 5: Solve for x
   x = 2,923,538.73/2,379.78
6. Step 6: Final answer
   x = 1,228.49