Jessica weighed her dog at the end of each month for three months. At the end of the first month, her dog gained 12.48 pounds. After the second month, her dog gained 20.57 pounds. After the third month, her dog gained 26.34 pounds. How many pounds, in total, did Jessica's dog gain after three months?

57.39 pounds

59.39 pounds

60.38 pounds

61.39 pounds