In order to solve this, we can start by converting the given mixed number to a regular fraction, we can do this like this:
1. multiply the whole number on the left of the fraction by the denominator of the fraction, like this:

2. Add the result from the previous step to the denominator of the fraction, like this:

3. Finally, leave the denominator unchanged:

Now that we found a fraction equivalent to 4 4/3, we just have to multiply this result by a conversion factor, since 1 pound is equivalent to 16 ounces we convert from pounds to ounces by multiplying by 16, like this:

Then, the 4 3/4 pounds are equivalent to 76 ounces