SAS simulate with random variable (repost)

1. Table1 has Col1 and Col2

2. Table2 is distinct Col1 as Col3 and generated random variable Col4

3. Simulate a function Col2*2 + Col4 where Col4 is based on Table1.Col1 = Table2.Col3

4. Col4 is diff for each trial

5. I don't really know how to do this but tried the below. Any help will be really appreciated.

   data monte_carlo; %let num = 10; do i = 1 to # do while(not eof); set Table2 end=eof; Col4 = rand('uniform'); put Col4; end; do while(not eof); set Table1 end=eof; Col2*2 + Col4; end; end; run;

Table1

Table2