Finding the Fourth Proportional to 12,378.27, 17,089.41 and 8,136.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,378.27 : 17,089.41 = 8,136.43 : x
2. Step 2: Convert to fraction form
   12,378.27/17,089.41 = 8,136.43/x
3. Step 3: Cross multiply
   12,378.27x = 17,089.41 × 8,136.43
4. Step 4: Simplify right side
   12,378.27x = 139,046,764.84
5. Step 5: Solve for x
   x = 139,046,764.84/12,378.27
6. Step 6: Final answer
   x = 11,233.14