In the given figure, \(PS =\) 4 \(cm\), \(PO =\) 3.6 \(cm\), \(PT =\) 5.6 \(cm\), \(PQ =\) 7 \(cm\) and \(PR =\) 9.8 \(cm\). Find the length of \(PM\).
 
13.svg
 
The length of \(PM\) is  \(cm\).
 
(Note: Write in decimal places if necessary.)