13.643 gallons, 63.74 dollars. how much is 1 gallon cost?

1.)   13 643  gallons   =>  63,74   dollars

 1 gallon   =>    $${\frac{{\mathtt{63.74}}}{{\mathtt{13\,643}}}} = {\mathtt{0.004\: \!671\: \!992\: \!963\: \!424\: \!5}}$$     dollars

2.)    13,643 gallons     =>    63,74  dollars

1  gallon    =>     $${\frac{{\mathtt{63.74}}}{{\mathtt{13.643}}}} = {\mathtt{4.671\: \!992\: \!963\: \!424\: \!466\: \!8}}$$     dollars