Finding the Fourth Proportional to 2,978.72, 4,451.92 and 2,745.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.72 : 4,451.92 = 2,745.28 : x
2. Step 2: Convert to fraction form
   2,978.72/4,451.92 = 2,745.28/x
3. Step 3: Cross multiply
   2,978.72x = 4,451.92 × 2,745.28
4. Step 4: Simplify right side
   2,978.72x = 12,221,766.94
5. Step 5: Solve for x
   x = 12,221,766.94/2,978.72
6. Step 6: Final answer
   x = 4,103.03