Finding the Fourth Proportional to 3,938.76, 5,400.27 and 3,868.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,938.76 : 5,400.27 = 3,868.56 : x
2. Step 2: Convert to fraction form
   3,938.76/5,400.27 = 3,868.56/x
3. Step 3: Cross multiply
   3,938.76x = 5,400.27 × 3,868.56
4. Step 4: Simplify right side
   3,938.76x = 20,891,268.51
5. Step 5: Solve for x
   x = 20,891,268.51/3,938.76
6. Step 6: Final answer
   x = 5,304.02