Select the missing number from the following options to complete the given series:
82,\, 103,\, 126,\, \text{____},\, 178,\, 207,\, 238

Let's investigate the difference between consecutive terms in the series:
* $103-82=21$
* $126-103=23$

The differences appear to increase by $+2$ consecutively ($21,23,25,27,\dots$). Let's test this hypothesis to find the missing term:

$$\text{Missing term}=126+25=151$$

Now let's check if the rest of the series matches with the subsequent differences ($+27,+29,+31$):

* $151+27=178$ (Matches)
* $178+29=207$ (Matches)
* $207+31=238$ (Matches)

The missing number is $151$.