#include<iostream>
using namespace std;
typedef long long LL;
const int mod = 200907;
LL res;

void qpower(int a, int b)
{
    res = 1;
    while(b)
    {
        if(b & 1)res = (LL)res * a % mod;
        b >>= 1;
        a =(LL) a * a % mod;
    }
}

int main()
{
    int n; cin >> n;
    while(n--)
    {
        int a, b, c, k;cin >> a >> b >> c >> k;
        if(a + c == 2 * b)
            res = a + (LL)(b - a) * (k - 1) % mod;
        else 
            {
                qpower(b / a, k - 1);
                res = (LL)res * a % mod;
            }
        cout << res << endl;
    }
    return 0;
}