Finding the Fourth Proportional to 21,196.67, 31,802.81 and 8,713.36

Step by Step Solution

1. Step 1: Write the proportion equation
   21,196.67 : 31,802.81 = 8,713.36 : x
2. Step 2: Convert to fraction form
   21,196.67/31,802.81 = 8,713.36/x
3. Step 3: Cross multiply
   21,196.67x = 31,802.81 × 8,713.36
4. Step 4: Simplify right side
   21,196.67x = 277,109,209.47
5. Step 5: Solve for x
   x = 277,109,209.47/21,196.67
6. Step 6: Final answer
   x = 13,073.24