Final answer:
The fourth juror is the one with a German accent, is a watchmaker, and the fourth to change his vote.
Step-by-step explanation:
The juror with a German accent, who is also a watchmaker, and is the fourth juror to change his vote, is the fourth juror. In the context of the question, the term "juror" refers to a member of the jury, which is a group of individuals selected to determine a verdict in a trial. The role of the jury is to carefully consider the evidence and arguments presented during the trial and reach a unanimous decision.