To convert feet to inches, we multiply by 12, since there are 12 inches in one foot.
4 1/2 feet can be written as 4 + 1/2 feet.
4 feet x 12 inches/foot = 48 inches
1/2 foot x 12 inches/foot = 6 inches
Therefore, the total width of the door in inches is:
48 inches + 6 inches = 54 inches