Finding the Fourth Proportional to 22,786.77, 31,447.29 and 12,717.15

Step by Step Solution

1. Step 1: Write the proportion equation
   22,786.77 : 31,447.29 = 12,717.15 : x
2. Step 2: Convert to fraction form
   22,786.77/31,447.29 = 12,717.15/x
3. Step 3: Cross multiply
   22,786.77x = 31,447.29 × 12,717.15
4. Step 4: Simplify right side
   22,786.77x = 399,919,904.02
5. Step 5: Solve for x
   x = 399,919,904.02/22,786.77
6. Step 6: Final answer
   x = 17,550.53