Three hobby websites have recently been posted and the Hobby Association of America wants to know how popular they are. Ari's site received $7,900$ pageviews. Barbara's site received $21,000$ pageviews, and Clive's site received $80,000$ pageviews. Ari's site averages $3$ pageview per visitor, Barbara's $6$ pageviews per visitor, and Clive's $9$ pageviews per visitor. A total of $4,000$ initiated shopping carts are recorded for Clive's site, with $36\%$ resulting in an order. Clive's display advertising costs $($in addition to search engine advertising$)$ for his site were $$9,760.$

What is the total number of visitors for all three sites combined?