Finding the Fourth Proportional to 21,196.24, 31,789.80 and 8,713.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,196.24 : 31,789.80 = 8,713.12 : x
2. Step 2: Convert to fraction form
   21,196.24/31,789.80 = 8,713.12/x
3. Step 3: Cross multiply
   21,196.24x = 31,789.80 × 8,713.12
4. Step 4: Simplify right side
   21,196.24x = 276,988,342.18
5. Step 5: Solve for x
   x = 276,988,342.18/21,196.24
6. Step 6: Final answer
   x = 13,067.81