At first glance it would appear that you could do an Insert, Cross-reference and select "Equation" as the reference type. Word puts "2a" in the denominator even though this is ambiguous the way we typed it. This makes your equation show up first, the category has to be alphabetically before "Built-in".
Word has a built-in list of recognized functions and will make this change automatically for these.
Math Type was not included in previous versions of Word but was available for purchase. Once you have inserted a Matrix, you will be able to right click on it to add or delete columns and rows.
These allow you to adjust the overall positioning of the matrix and the row and column spacing. Then you will be able to set the value for both the chapter number and the equation number.
The stocks were not worth the same amount in the beginning, so if each stock loses half its value, the new values will not be equal either.
You can also access settings for alignment of rows and columns.
Under Insert reference to select Paragraph number full context and click Insert.