C :

#include <stdio.h>

int main()
{
    for(int p = 1; p<100; p++){
        for(int q = p; q< 100; q++){
            for(int r = q; r< 100; r++){
                for(int s = r; s< 100; s++){
                    if(p * q * r + p * q * s + p * r * s + q * r * s == p * q * r * s){
                        printf("%d %d %d %d\n", p, q, r, s);
                    }
                }
            }
        }
    }
}

C++ :

#include<iostream>
using namespace std;
int main(){

 int p,q,r,s,count=0;

    for(p=2;p<5;p++)                

        for(q=p;q<7;q++)

            for(r=q;r<13;r++)

                if(p*q*r-q*r-p*r-p*q!=0)

                {
                    s=(p*q*r)/(p*q*r-q*r-p*r-p*q);     

                    if(!((p*q*r)%(p*q*r-q*r-p*r-p*q))&&s>=r)
					{
						cout<<p<<" "<<q<<" "<<r<<" "<<s<<" "<<endl; 
					} 
                         
               }
	
	return 0;
}

Java :

public class Main{ 
	public static void main(String[] args){	
		int c = 0;
		for (int p = 2;p<=4;p++) {
			for (int q = p;q<=6;q++) {
				for(int r = q;r<=12;r++) {
					for(int s = r;s<=42;s++) {
						if(q*r*s+p*r*s+p*q*s+p*q*r == p*q*r*s) {
							System.out.println(p + " " + q + " " + r +" " + s);
						}
					}
				}
			}
		}
	}
}

Python :

for p in range(1,100):
    for q in range(p,100):
        for r in range(q,100):
            for s in range(r,100):
                if p * q * r + p * q * s + p * r * s + q * r * s == p * q * r * s:
                    print(p,q,r,s)