Finding the Fourth Proportional to 3,936.26, 5,396.84 and 3,866.06

Step by Step Solution

1. Step 1: Write the proportion equation
   3,936.26 : 5,396.84 = 3,866.06 : x
2. Step 2: Convert to fraction form
   3,936.26/5,396.84 = 3,866.06/x
3. Step 3: Cross multiply
   3,936.26x = 5,396.84 × 3,866.06
4. Step 4: Simplify right side
   3,936.26x = 20,864,507.25
5. Step 5: Solve for x
   x = 20,864,507.25/3,936.26
6. Step 6: Final answer
   x = 5,300.59