def get_top_capabilities(capabilities):
    """
    Returns the top capabilities based on their values.

    Args:
        capabilities (list): A list of tuples containing capability information.

    Returns:
        tuple: The top capability with its value and rank.
    """
    return max(capabilities, key=lambda x: x[1])

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

print(get_top_capabilities(capabilities))