Format the title according to the title style and number the title. Put the cursor behind the formula, enter the Insert menu-Citation-Inscription, select the formula in the Inscription dialog box, click the number button, check the chapter number and confirm.

Do the same thing every time you enter a formula. In the Title dialog box, click Auto Insert Title, and then select Formula Object in Object.

As long as you enter a formula in the formula editor, numbers will be automatically inserted.

The advantage of this is that if a formula is inserted in front of any formula, the numbers will be updated automatically, and there is no need to modify each one, so they will be sorted automatically.