In 5.{_{4}**(•)}5{_{4}**(•)}, 5.{_{4}**(•)}{_{5}**(•) }4, 5.4, 5. {_{4}**(•)}, 5.54, what is the largest number?
在5.{_{4}**(•)}5{_{4}**(•)}，5.{_{4}**(•)}{_{5}**(•)}4，5.4，5.{_{4}**(•)}，5.54这五个数中，最大的数是多少．
<result>5.54</result>