Question 1201463
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Unfortunately questions like this are too vague. 


See this link for more information 
<a href = "https://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.1195799.html">https://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.1195799.html</a>


In that link I go over an example how the sequence 1,2,4 could generate at least 3 different next terms.
Therefore, we simply don't have enough information for that problem. 
The same can be said if the missing term is between other given terms. 


Here's a similar question of sorts
<a href = "https://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.1197171.html">https://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.1197171.html</a>
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