[cpp]
#include
long long f(long long a,long long b)
{
long long ans=1;
while(b)
{
if(b%2==1)
ans=(ans*a)%200907;
b=b/2;
a=(a*a)%200907;
}
return ans;
}
int main()
{
long long a,b,c,k,n;
while(scanf("%lld",&n)!=EOF)
{
while(n--)
{
scanf("%lld %lld %lld %lld",&a,&b,&c,&k);
if(b-a==c-b)
printf("%lld\n",(a%200907+(k-1)%200907*(b-a)%200907)%200907);
else
printf("%lld\n",(a%200907*f(b/a,k-1))%200907);
}
}
}