Finding the Fourth Proportional to 12,392.59, 17,090.05 and 8,136.14

Step by Step Solution

1. Step 1: Write the proportion equation
   12,392.59 : 17,090.05 = 8,136.14 : x
2. Step 2: Convert to fraction form
   12,392.59/17,090.05 = 8,136.14/x
3. Step 3: Cross multiply
   12,392.59x = 17,090.05 × 8,136.14
4. Step 4: Simplify right side
   12,392.59x = 139,046,998.73
5. Step 5: Solve for x
   x = 139,046,998.73/12,392.59
6. Step 6: Final answer
   x = 11,220.17