You could work with bookmarks and link directly to the number. Just select the text of the caption and invoke Insert=>Bookmark and give it a name. Then select the text that refers to that bookmark (in your case 'As we can see in Eqn. 4 ....' ) ,invoke Format=>Link and select the bookmark.
This procedure will create a link to the Eqn. 4. But, of course, it won't work when the document is printed. The reader of the printed version cannot use it. He needs a printed cross reference, so he can understand the document.
I have worked with Word and OpenOffice. They provide the ability to cross reference captions of Tables, Objects, etc. I think there must be a way to do this in Text Maker. It is so important for scientific and engineering articles!