Finding the Fourth Proportional to 8,786.24, 13,131.87 and 8,085.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,786.24 : 13,131.87 = 8,085.72 : x
2. Step 2: Convert to fraction form
   8,786.24/13,131.87 = 8,085.72/x
3. Step 3: Cross multiply
   8,786.24x = 13,131.87 × 8,085.72
4. Step 4: Simplify right side
   8,786.24x = 106,180,623.90
5. Step 5: Solve for x
   x = 106,180,623.90/8,786.24
6. Step 6: Final answer
   x = 12,084.88