Finding the Fourth Proportional to 10,863.86, 14,991.09 and 8,631.14

Step by Step Solution

1. Step 1: Write the proportion equation
   10,863.86 : 14,991.09 = 8,631.14 : x
2. Step 2: Convert to fraction form
   10,863.86/14,991.09 = 8,631.14/x
3. Step 3: Cross multiply
   10,863.86x = 14,991.09 × 8,631.14
4. Step 4: Simplify right side
   10,863.86x = 129,390,196.54
5. Step 5: Solve for x
   x = 129,390,196.54/10,863.86
6. Step 6: Final answer
   x = 11,910.15