font-weight property is not working in inline style

I am inserting html code through database, we don't have separate styling sheet. So we are using inline styling.

I used below code

<li style="font-family: Arial; font-size: 13pt;Color: #711984; font-weight: bold">
 Cross-border Transfer
</li>

But font-weight property is not applicable, I don't see bold fonts.

I tried below code, it works but I don't think its recommended for best practices:

<b>
<li style="font-family: Arial; font-size: 13pt;Color: #711984;">
 Cross-border Transfer
</li>
</b>