Finding the Fourth Proportional to 12,415.27, 17,136.78 and 8,169.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,415.27 : 17,136.78 = 8,169.61 : x
2. Step 2: Convert to fraction form
   12,415.27/17,136.78 = 8,169.61/x
3. Step 3: Cross multiply
   12,415.27x = 17,136.78 × 8,169.61
4. Step 4: Simplify right side
   12,415.27x = 140,000,766.41
5. Step 5: Solve for x
   x = 140,000,766.41/12,415.27
6. Step 6: Final answer
   x = 11,276.50