Finding the Fourth Proportional to 7,144.78, 9,859.82 and 3,958.22

Step by Step Solution

1. Step 1: Write the proportion equation
   7,144.78 : 9,859.82 = 3,958.22 : x
2. Step 2: Convert to fraction form
   7,144.78/9,859.82 = 3,958.22/x
3. Step 3: Cross multiply
   7,144.78x = 9,859.82 × 3,958.22
4. Step 4: Simplify right side
   7,144.78x = 39,027,336.72
5. Step 5: Solve for x
   x = 39,027,336.72/7,144.78
6. Step 6: Final answer
   x = 5,462.36