Finding the Fourth Proportional to 15,786.82, 21,785.71 and 8,713.25

Step by Step Solution

1. Step 1: Write the proportion equation
   15,786.82 : 21,785.71 = 8,713.25 : x
2. Step 2: Convert to fraction form
   15,786.82/21,785.71 = 8,713.25/x
3. Step 3: Cross multiply
   15,786.82x = 21,785.71 × 8,713.25
4. Step 4: Simplify right side
   15,786.82x = 189,824,185.16
5. Step 5: Solve for x
   x = 189,824,185.16/15,786.82
6. Step 6: Final answer
   x = 12,024.22