Tolong dijawab pake caranya

Tolong dijawab pake caranya

$7 sqrt{12} times sqrt{27} times 3 sqrt{3} \ = 7 sqrt{4.3} times sqrt{9.3} times 3 sqrt{3} \ = 7.2 sqrt{3} times 3 sqrt{3} times 3 sqrt{3} \ = 14 sqrt{3} times 3 sqrt{3} times 3 sqrt{3} \ = 126 sqrt{27} \ = 126 sqrt{9.3} \ = 126.3 sqrt{3} \ = 378 sqrt{ 3}$