Finding the Fourth Proportional to 21,196.78, 29,250.57 and 11,636.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,196.78 : 29,250.57 = 11,636.47 : x
2. Step 2: Convert to fraction form
   21,196.78/29,250.57 = 11,636.47/x
3. Step 3: Cross multiply
   21,196.78x = 29,250.57 × 11,636.47
4. Step 4: Simplify right side
   21,196.78x = 340,373,380.29
5. Step 5: Solve for x
   x = 340,373,380.29/21,196.78
6. Step 6: Final answer
   x = 16,057.79