Finding the Fourth Proportional to 3,891.16, 5,326.83 and 3,863.37

Step by Step Solution

1. Step 1: Write the proportion equation
   3,891.16 : 5,326.83 = 3,863.37 : x
2. Step 2: Convert to fraction form
   3,891.16/5,326.83 = 3,863.37/x
3. Step 3: Cross multiply
   3,891.16x = 5,326.83 × 3,863.37
4. Step 4: Simplify right side
   3,891.16x = 20,579,515.22
5. Step 5: Solve for x
   x = 20,579,515.22/3,891.16
6. Step 6: Final answer
   x = 5,288.79