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#include <bits/stdc++.h>
using namespace std;
#define int long long
const int MOD = 200907;
// 快速幂
int qmi(int a, int b) {
int res = 1;
while (b) {
if (b & 1) res = res * a % MOD;
a = a * a % MOD;
b >>= 1;
}
return res;
}
signed main() {
int n;
cin >> n;
while (n--) {
int a, b, c, k;
cin >> a >> b >> c >> k;
if (a + c == b * 2) // 等差
cout << (a + (b - a) * (k - 1)) % MOD << endl; // 这个比较简单
else // 等比
cout << a * qmi(b / a, k - 1) % MOD << endl; // 这个需要快速幂
}
}