Divided difference columns :    
 
    0.       
    0.40547  
    0.55962  
    0.69315  
    0.09531  
 
    0.81094  
    0.6166   
    0.53412  
    0.66427  
 
  - 0.25912  
  - 0.16496  
  - 0.20023  
 
    0.09416  
    0.08816  
 
  - 0.05996  
 
 The interpolated value at 1.3 using p3(x) is :    
 
    0.26137  
 
 The interpolated value at 1.3 using p4(x) is :    
 
    0.26250