Order by the latest (most recent) related model [Laravel]

I am using Laravel 5.4 and I have the following relations:

• Forum hasMany Thread (threads())
• Thread hasMany Post (posts())
• Thread belongsTo User (user())
• Post belongsTo User (user())

Currently, in my ThreadsController@index I have the following:

public function index()
{
    $threads = $this->forum->threads()
        ->approved()
        ->withCount(['posts AS approved_replies' => function ($query) {
            $query->where('posts.approved', true)->where('posts.is_starting_thread', false);
        }])
        ->with(['posts' => function ($query) { // Posts
            $query->approved()
                ->with('user') // Author of post
                ->latest();
            }]
        )
        ->with('user') // Author of thread
        ->latest()
        ->paginate(20); 

    return view('forums.threads.index')->with([
        'forum' => $this->forum, 'threads' => $threads
    ]);
}

My index.blade.php should show the listing of threads in which for each thread there will be:

• its author (that's why I have ->with('user'))
• number of replies (that's why I have >withCount(['posts AS approved_replies' => function ($query) { ...)

• Date of the newest (latest) post and its author. That's why:

      ->with(['posts' => function ($query) { // Posts
          $query->approved()
              ->with('user') // Author of post
              ->latest(); // LATEST first
          }]
      )
  
  

  ... because then in index.blade.php I can access the latest post of each thread in the following way:

  @foreach ($threads as $thread) 
      
      
  @endforeach 
  
  

The problem with this code is that threads are sorted by their created_at, not by the most recent post. What I want to achieve is to order threads by the latest (most recent) post, but I don't know how to do this.

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