Finding the Fourth Proportional to 2,278.78, 3,144.83 and 1,284.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,278.78 : 3,144.83 = 1,284.17 : x
2. Step 2: Convert to fraction form
   2,278.78/3,144.83 = 1,284.17/x
3. Step 3: Cross multiply
   2,278.78x = 3,144.83 × 1,284.17
4. Step 4: Simplify right side
   2,278.78x = 4,038,474.20
5. Step 5: Solve for x
   x = 4,038,474.20/2,278.78
6. Step 6: Final answer
   x = 1,772.21