Finding the Fourth Proportional to 21,227.73, 31,806.73 and 12,910.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,227.73 : 31,806.73 = 12,910.15 : x
2. Step 2: Convert to fraction form
   21,227.73/31,806.73 = 12,910.15/x
3. Step 3: Cross multiply
   21,227.73x = 31,806.73 × 12,910.15
4. Step 4: Simplify right side
   21,227.73x = 410,629,655.31
5. Step 5: Solve for x
   x = 410,629,655.31/21,227.73
6. Step 6: Final answer
   x = 19,344.02