Final answer:
Dan is responsible for paying the unauthorized charges made on his credit card, which is x dollars. However, his liability might be limited based on his credit card's terms and conditions, so he should contact his credit card company.
Step-by-step explanation:
Dan is responsible for paying the amount charged on his credit card by the person who found it, which is x dollars. However, since x > $200, it is important to note that most credit card companies have liability limits for unauthorized charges. Therefore, Dan may be responsible for paying only a portion of the x dollars, depending on his credit card's terms and conditions. He should contact his credit card company to report the unauthorized charges and discuss his liability.