What does Daniel 5:7 mean?

He shouted for his astrologers, magicians, and wise men to be brought in. He promised that anyone who could read the writing and explain it would get a royal robe, a gold chain, and be made the third most powerful person in the kingdom. Daniel 5:7 - Modern Text Bible

(Belshazzar desperately seeks answers from his advisors, offering big rewards for anyone who can interpret the message.)