def extract_key_data(data):
    """
    Extracts key data from a list of tuples.

    Args:
        data (list): List of tuples containing version, value, and other metrics.

    Returns:
        tuple: Tuple containing the version with the highest value.
    """
    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)]

print(extract_key_data(data))