Finding the Fourth Proportional to 3,922.72, 5,425.37 and 3,857.11

Step by Step Solution

1. Step 1: Write the proportion equation
   3,922.72 : 5,425.37 = 3,857.11 : x
2. Step 2: Convert to fraction form
   3,922.72/5,425.37 = 3,857.11/x
3. Step 3: Cross multiply
   3,922.72x = 5,425.37 × 3,857.11
4. Step 4: Simplify right side
   3,922.72x = 20,926,248.88
5. Step 5: Solve for x
   x = 20,926,248.88/3,922.72
6. Step 6: Final answer
   x = 5,334.63