Finding the Fourth Proportional to 9,196.86, 12,660.54 and 8,309.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,196.86 : 12,660.54 = 8,309.88 : x
2. Step 2: Convert to fraction form
   9,196.86/12,660.54 = 8,309.88/x
3. Step 3: Cross multiply
   9,196.86x = 12,660.54 × 8,309.88
4. Step 4: Simplify right side
   9,196.86x = 105,207,568.14
5. Step 5: Solve for x
   x = 105,207,568.14/9,196.86
6. Step 6: Final answer
   x = 11,439.51