Finding the Fourth Proportional to 5,651.34, 7,791.57 and 3,879.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,651.34 : 7,791.57 = 3,879.78 : x
2. Step 2: Convert to fraction form
   5,651.34/7,791.57 = 3,879.78/x
3. Step 3: Cross multiply
   5,651.34x = 7,791.57 × 3,879.78
4. Step 4: Simplify right side
   5,651.34x = 30,229,577.45
5. Step 5: Solve for x
   x = 30,229,577.45/5,651.34
6. Step 6: Final answer
   x = 5,349.10