The product of the first and the third terms of an arithmetic sequence is $5$. If all terms of the sequence are positive integers, what is the fourth term?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
The product of the first and the third terms of an arithmetic sequence is $5$. If all terms of the sequence are positive integers, what is the fourth term?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
7
The product of the first and the third terms of an arithmetic sequence is $5$. If all terms of the sequence are positive integers, what is the fourth term?
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