On Thursday the 11th October, GlaxoSmithKline paid out its October dividend.
It was 19p a share.
The total number of voting rights in GSK is 4,960,316,601
https://www.londonstockexchange.com/exchange/news/market-news/market-news-detail/GSK/13777222.html
Thus:-
4,960,316,601 x £0.19 = £942,460,154.19
That is £942m
http://www.shareshop.hsbc.co.uk/shareshop/security.cgi?csi=10042
5.5% is the yield.