Find the positive base $b$ in which the equation $4 \cdot 12 = 103$ is valid.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Find the positive base $b$ in which the equation $4 \cdot 12 = 103$ is valid.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
5
Find the positive base $b$ in which the equation $4 \cdot 12 = 103$ is valid.
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