4.8792 lb
1)Since a 12 inch weighs 0.428 lb
2) We need to convert a 11.4 ft to lb
1 ft -----12 inches
11.4 -----x
x=136.8 inches
3) If a 12 inches long steel weighs 0.428 lb, let's calculate the weight of 136.8 inches cable
12 inches -----------------0 .428 lb
136.8 inches ------- y
12y =0.428 x 136.8
12y =58.5504
y=4.8792 lb