Finding the Fourth Proportional to 3,868.37, 5,341.91 and 3,661.21

Step by Step Solution

1. Step 1: Write the proportion equation
   3,868.37 : 5,341.91 = 3,661.21 : x
2. Step 2: Convert to fraction form
   3,868.37/5,341.91 = 3,661.21/x
3. Step 3: Cross multiply
   3,868.37x = 5,341.91 × 3,661.21
4. Step 4: Simplify right side
   3,868.37x = 19,557,854.31
5. Step 5: Solve for x
   x = 19,557,854.31/3,868.37
6. Step 6: Final answer
   x = 5,055.84