Finding the Fourth Proportional to 2,274.63, 3,138.87 and 1,280.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,274.63 : 3,138.87 = 1,280.07 : x
2. Step 2: Convert to fraction form
   2,274.63/3,138.87 = 1,280.07/x
3. Step 3: Cross multiply
   2,274.63x = 3,138.87 × 1,280.07
4. Step 4: Simplify right side
   2,274.63x = 4,017,973.32
5. Step 5: Solve for x
   x = 4,017,973.32/2,274.63
6. Step 6: Final answer
   x = 1,766.43