Finding the Fourth Proportional to 12,196.86, 16,814.43 and 8,658.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,196.86 : 16,814.43 = 8,658.78 : x
2. Step 2: Convert to fraction form
   12,196.86/16,814.43 = 8,658.78/x
3. Step 3: Cross multiply
   12,196.86x = 16,814.43 × 8,658.78
4. Step 4: Simplify right side
   12,196.86x = 145,592,450.20
5. Step 5: Solve for x
   x = 145,592,450.20/12,196.86
6. Step 6: Final answer
   x = 11,936.88