Finding the Fourth Proportional to 22,856.79, 31,542.24 and 12,786.33

Step by Step Solution

1. Step 1: Write the proportion equation
   22,856.79 : 31,542.24 = 12,786.33 : x
2. Step 2: Convert to fraction form
   22,856.79/31,542.24 = 12,786.33/x
3. Step 3: Cross multiply
   22,856.79x = 31,542.24 × 12,786.33
4. Step 4: Simplify right side
   22,856.79x = 403,309,489.58
5. Step 5: Solve for x
   x = 403,309,489.58/22,856.79
6. Step 6: Final answer
   x = 17,645.06