Can a further away quieter voice in a clip be automatically made louder to match a louder voice?

Steve is right.  You can't fix bad audio.  But, there is a chance you can make it better.  I learned this the hard way!

Cut the section with the quiet speaker and raise the volume in that section.  It will increase the noise.  Find a combination of Noise Reduction audio effects that improves the section.   Next, make cuts around all the too quiet sections and select them into a group.  Now, you can copy and paste the effects applied to from the first  maniputlated section to all the sections. 

Paul, if you are going to do a lot of this there are some mic systems you should try.