title: How to get field which has fifth in the order of the highest value in pandas
body: <p>I am using pandas and I have dataset something like this:</p>
  
  <pre><code>**ID name total-cost**
    1  a    7
    2  b    4
    3  c    1
    4  e    6
    5  f    80
    6  k    85
  </code></pre>
  
  <p>So I need to get the fifth value in the order of the highest of total-cost, which is here 4 [85 80 7 6 <strong>4</strong> 1]. Not name, not ID, just a value.</p>