Finding the Fourth Proportional to 3,943.38, 5,430.79 and 3,857.27

Step by Step Solution

1. Step 1: Write the proportion equation
   3,943.38 : 5,430.79 = 3,857.27 : x
2. Step 2: Convert to fraction form
   3,943.38/5,430.79 = 3,857.27/x
3. Step 3: Cross multiply
   3,943.38x = 5,430.79 × 3,857.27
4. Step 4: Simplify right side
   3,943.38x = 20,948,003.07
5. Step 5: Solve for x
   x = 20,948,003.07/3,943.38
6. Step 6: Final answer
   x = 5,312.20