How to take the Nth value?

Hi Experts,

I am having a situation where I need to take the nth value after sorting in ascending order. Suppose, if

1. 10,

2. 20,

3. 30,

4. 40,

5. 50,

How to take the third value that is 30 and put it in the query designer?

Thanks in advance,

Regards,

Kannan