Finding the Fourth Proportional to 2,278.67, 3,143.98 and 1,394.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,278.67 : 3,143.98 = 1,394.15 : x
2. Step 2: Convert to fraction form
   2,278.67/3,143.98 = 1,394.15/x
3. Step 3: Cross multiply
   2,278.67x = 3,143.98 × 1,394.15
4. Step 4: Simplify right side
   2,278.67x = 4,383,179.72
5. Step 5: Solve for x
   x = 4,383,179.72/2,278.67
6. Step 6: Final answer
   x = 1,923.57