Finding the Fourth Proportional to 2,278.54, 3,144.72 and 1,394.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,278.54 : 3,144.72 = 1,394.20 : x
2. Step 2: Convert to fraction form
   2,278.54/3,144.72 = 1,394.20/x
3. Step 3: Cross multiply
   2,278.54x = 3,144.72 × 1,394.20
4. Step 4: Simplify right side
   2,278.54x = 4,384,368.62
5. Step 5: Solve for x
   x = 4,384,368.62/2,278.54
6. Step 6: Final answer
   x = 1,924.20