Answer: 4

Step-by-step explanation:
I'm a little confused with what you included in your question, so apologies if this misses the mark.
The Volume of a Sphere is found by the equation:

In order to find the volume of a baseball with the radius 1, we simply replace r with 1:

Which can be simplified to:

Solving this will give you the answer 4.18879...
Which can be rounded to 4.
Hope this helped. If you need anything else let me know.