You can retrieve the index of the post in the loop with $wp_query->current_post. From that, you can check with a simple if-statement:
/*Check if post index is 2 (you referred to the 3rd post, given indexing starts from 0, the 3rd post index would be 2 */
if ( $wp_query->current_post == 2 ) :
/* Do something */
else:
/* Do something else */
endif;
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