Finding the Fourth Proportional to 2,274.66, 3,138.72 and 1,279.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,274.66 : 3,138.72 = 1,279.80 : x
2. Step 2: Convert to fraction form
   2,274.66/3,138.72 = 1,279.80/x
3. Step 3: Cross multiply
   2,274.66x = 3,138.72 × 1,279.80
4. Step 4: Simplify right side
   2,274.66x = 4,016,933.86
5. Step 5: Solve for x
   x = 4,016,933.86/2,274.66
6. Step 6: Final answer
   x = 1,765.95