Finding the Fourth Proportional to 2,274.40, 3,138.78 and 1,279.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,274.40 : 3,138.78 = 1,279.72 : x
2. Step 2: Convert to fraction form
   2,274.40/3,138.78 = 1,279.72/x
3. Step 3: Cross multiply
   2,274.40x = 3,138.78 × 1,279.72
4. Step 4: Simplify right side
   2,274.40x = 4,016,759.54
5. Step 5: Solve for x
   x = 4,016,759.54/2,274.40
6. Step 6: Final answer
   x = 1,766.07