dynamically changing the APEX_ITEM. TEXT value in Oracle apex

I have an application where I have created classic report. it has 4 columns.

SELECT KEY,  
  APEX_ITEM.TEXT(6,attribute3,10) attribute3,  
  APEX_ITEM.HIDDEN(3,KEY) ||  
  APEX_ITEM.TEXT(4,attribute1, 10) attribute1,  
  APEX_ITEM.TEXT(5,attribute2, 10) attribute2    
FROM table1 ;

I want to dynamically change the value for attribute2 based on attribute1.

attribute2 = attribute3*attribute1, where attribute3 will be pre-fetched and attribute1 will be entered by user.

I want to calculate attribute3 on-fly(dynamically), based on changes in attribute1.

Version: 4.2.1