Finding the Fourth Proportional to 2,067.78, 2,850.89 and 1,320.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,067.78 : 2,850.89 = 1,320.49 : x
2. Step 2: Convert to fraction form
   2,067.78/2,850.89 = 1,320.49/x
3. Step 3: Cross multiply
   2,067.78x = 2,850.89 × 1,320.49
4. Step 4: Simplify right side
   2,067.78x = 3,764,571.74
5. Step 5: Solve for x
   x = 3,764,571.74/2,067.78
6. Step 6: Final answer
   x = 1,820.59