How Do You Correctly Calculate Vk in a Basic Circuit Using KVL?

[J.live]

Homework Statement

Find the value of Vk

http://oi54.tinypic.com/2s6x005.jpg

Homework Equations

The Attempt at a Solution

Assuming dependent Vk = 12i

-60 + 4i + 12i + 12i = 0

-60 + 28i = 0

i = 2.14

Vk = 12 * 2.14 = 25 .68 ?

Answer is 18. Can someone tell me where I am going wrong ?

 

[CEL]

Your calculations are correct.