def calculate_best_version(data):
    """
    Calculate the best version based on a list of tuples containing version info.

    Args:
        data (list): List of tuples containing version info.

    Returns:
        tuple: The best version and its corresponding values.
    """
    return max(data, key=lambda x: x[1])

# Example usage
data = [('v5_1768236144', 108217.11959687909, 721, 15009.3),
       ('v5_1768235312', 89435.63603047856, 734, 12184.7),
       ('v5_1768235983', 98379.19963352643, 987, 9967.5)]

best_version = calculate_best_version(data)
print(best_version)