Finding the Fourth Proportional to 2,067.12, 2,851.20 and 1,978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,067.12 : 2,851.20 = 1,978.56 : x
2. Step 2: Convert to fraction form
   2,067.12/2,851.20 = 1,978.56/x
3. Step 3: Cross multiply
   2,067.12x = 2,851.20 × 1,978.56
4. Step 4: Simplify right side
   2,067.12x = 5,641,270.27
5. Step 5: Solve for x
   x = 5,641,270.27/2,067.12
6. Step 6: Final answer
   x = 2,729.05