Finding the Fourth Proportional to 2,274.78, 3,139.11 and 1,279.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,274.78 : 3,139.11 = 1,279.98 : x
2. Step 2: Convert to fraction form
   2,274.78/3,139.11 = 1,279.98/x
3. Step 3: Cross multiply
   2,274.78x = 3,139.11 × 1,279.98
4. Step 4: Simplify right side
   2,274.78x = 4,017,998.02
5. Step 5: Solve for x
   x = 4,017,998.02/2,274.78
6. Step 6: Final answer
   x = 1,766.32