This is a perennial question so I hope you will not mind me submitting another answer.
The problem with the "table" approach is that it breaks the paragraph. This can cause spacing issues if your equation is part of a continuous sentence and your paragraphs have spacing before or after them. It also means that wrapping is done rather poorly for long equations (the usual preference in journals is that, if the equation is the width of the column, the number should appear below the equation right aligned instead of breaking the equation). Finally it does nothing to solve the problem that you wish to have punctuation marks instantly after your Display equation in the normal paragraph font.
My solution is to insert a hidden paragraph break instantly after the equation. (With hidden characters showing, insert a normal paragraph break by pressing the return key, then select it and press ctrl+shift+H on a Mac, not sure of the Windows combination.) Then you may insert a tab and the appropriate equation number.
When you hide hidden characters, the equation remains in the Display equation form, centred, but any additional text appears immediately after it on the same line.
Another alternative is to insert a Style Separator in place of a hidden paragraph break. This accomplishes the same effect. However Style Separators are not available on the Macintosh edition of Word.
Note this behaviour is undocumented and your equations sometimes become left-aligned instead of centred. I have yet to understand why.