Finding the Fourth Proportional to 2,222.69, 3,067.31 and 1,278.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,222.69 : 3,067.31 = 1,278.67 : x
2. Step 2: Convert to fraction form
   2,222.69/3,067.31 = 1,278.67/x
3. Step 3: Cross multiply
   2,222.69x = 3,067.31 × 1,278.67
4. Step 4: Simplify right side
   2,222.69x = 3,922,077.28
5. Step 5: Solve for x
   x = 3,922,077.28/2,222.69
6. Step 6: Final answer
   x = 1,764.56