How do you know convert 45.6kw to hp?

1 watt is equal to 0.001 kW, or 0.00134048257373 hp

so that means 0.001kw=0.00134048257373 hp

so you times each side by 1,000 which would get you

1kw=1.34048257373hp so now times by your 45.6

so 45.6kw= 61.126005362088 hp