Finding the Fourth Proportional to 21,215.26, 31,796.76 and 8,727.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,215.26 : 31,796.76 = 8,727.49 : x
2. Step 2: Convert to fraction form
   21,215.26/31,796.76 = 8,727.49/x
3. Step 3: Cross multiply
   21,215.26x = 31,796.76 × 8,727.49
4. Step 4: Simplify right side
   21,215.26x = 277,505,904.93
5. Step 5: Solve for x
   x = 277,505,904.93/21,215.26
6. Step 6: Final answer
   x = 13,080.49