Finding the Fourth Proportional to 2,279.21, 3,144.61 and 1,394.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.21 : 3,144.61 = 1,394.09 : x
2. Step 2: Convert to fraction form
   2,279.21/3,144.61 = 1,394.09/x
3. Step 3: Cross multiply
   2,279.21x = 3,144.61 × 1,394.09
4. Step 4: Simplify right side
   2,279.21x = 4,383,869.35
5. Step 5: Solve for x
   x = 4,383,869.35/2,279.21
6. Step 6: Final answer
   x = 1,923.42