Finding the Fourth Proportional to 3,971.28, 5,506.55 and 3,839.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,971.28 : 5,506.55 = 3,839.56 : x
2. Step 2: Convert to fraction form
   3,971.28/5,506.55 = 3,839.56/x
3. Step 3: Cross multiply
   3,971.28x = 5,506.55 × 3,839.56
4. Step 4: Simplify right side
   3,971.28x = 21,142,729.12
5. Step 5: Solve for x
   x = 21,142,729.12/3,971.28
6. Step 6: Final answer
   x = 5,323.91