Finding the Fourth Proportional to 8,553.36, 12,850.59 and 8,081.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,553.36 : 12,850.59 = 8,081.31 : x
2. Step 2: Convert to fraction form
   8,553.36/12,850.59 = 8,081.31/x
3. Step 3: Cross multiply
   8,553.36x = 12,850.59 × 8,081.31
4. Step 4: Simplify right side
   8,553.36x = 103,849,601.47
5. Step 5: Solve for x
   x = 103,849,601.47/8,553.36
6. Step 6: Final answer
   x = 12,141.38