If weighed 4.23 pounds what is this in pounds and ounces?

(pounds x 0.453 = kg). So, 2.4 x 0.453 = 1.0872 kg

To be pedantic, the factor is 0.45359237, which rounds to 0.454. Using that multiplier gives 2.4 lbs = 1.089 kg. In either case, it is 1.09 kg.