Finding the Fourth Proportional to 21,196.04, 31,786.71 and 10,661.99

Step by Step Solution

1. Step 1: Write the proportion equation
   21,196.04 : 31,786.71 = 10,661.99 : x
2. Step 2: Convert to fraction form
   21,196.04/31,786.71 = 10,661.99/x
3. Step 3: Cross multiply
   21,196.04x = 31,786.71 × 10,661.99
4. Step 4: Simplify right side
   21,196.04x = 338,909,425.22
5. Step 5: Solve for x
   x = 338,909,425.22/21,196.04
6. Step 6: Final answer
   x = 15,989.28