Finding the Fourth Proportional to 21,636.82, 29,858.41 and 12,205.38

Step by Step Solution

1. Step 1: Write the proportion equation
   21,636.82 : 29,858.41 = 12,205.38 : x
2. Step 2: Convert to fraction form
   21,636.82/29,858.41 = 12,205.38/x
3. Step 3: Cross multiply
   21,636.82x = 29,858.41 × 12,205.38
4. Step 4: Simplify right side
   21,636.82x = 364,433,240.25
5. Step 5: Solve for x
   x = 364,433,240.25/21,636.82
6. Step 6: Final answer
   x = 16,843.20