Looping through custom data in a custom table to display all items in a post

Try below code. it will get all data from that table and update page content. you can modify as per your need. let me know if this works for you.i assume that $inf->name is return just names.

function update_insert_page() {
    global $wpdb;
    $table_name = $wpdb->base_prefix . 'portalorgs';
    $info = $wpdb->get_results( "SELECT * FROM $table_name" );

  $orgname="";
  if(!empty($info))
  {
    foreach ($info as $inf) {
      $orgname .= 'Name :'.$inf->name.'<br/>';
    }
     $insertpage = array(
      'ID'           => 224,
      'post_content' => $orgname
    );
    wp_update_post( $insertpage );
   }

}