Finding the Fourth Proportional to 2,222.78, 3,067.47 and 1,228.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,222.78 : 3,067.47 = 1,228.15 : x
2. Step 2: Convert to fraction form
   2,222.78/3,067.47 = 1,228.15/x
3. Step 3: Cross multiply
   2,222.78x = 3,067.47 × 1,228.15
4. Step 4: Simplify right side
   2,222.78x = 3,767,313.28
5. Step 5: Solve for x
   x = 3,767,313.28/2,222.78
6. Step 6: Final answer
   x = 1,694.87