from typing import List
import math


def lcm_all(numbers: List[int]) -> int:
    """LCM of all `numbers` in a list.

    Args:
        numbers (List[int]): list of numbers to get LCM

    Returns:
        int: the lowest common multiple

    """
    lcm = numbers.pop(0)
    for number in numbers:
        lcm = number * lcm // math.gcd(number, lcm)

    return lcm