Finding the Fourth Proportional to 21,786.09, 32,691.89 and 8,636.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,786.09 : 32,691.89 = 8,636.82 : x
2. Step 2: Convert to fraction form
   21,786.09/32,691.89 = 8,636.82/x
3. Step 3: Cross multiply
   21,786.09x = 32,691.89 × 8,636.82
4. Step 4: Simplify right side
   21,786.09x = 282,353,969.39
5. Step 5: Solve for x
   x = 282,353,969.39/21,786.09
6. Step 6: Final answer
   x = 12,960.29