In[1]:= xList = {4, 3, 7}
Out[1]= {4, 3, 7}
In[2]:= yList = {1, 6, 8, 10}
Out[2]= {1, 6, 8, 10}
In[3]:= Table[{x, y, f[x, y]}, {x, xList}, {y, yList}]
Out[3]= {{{4, 1, f[4, 1]}, {4, 6, f[4, 6]}, {4, 8, f[4, 8]}, {4, 10,
f[4, 10]}}, {{3, 1, f[3, 1]}, {3, 6, f[3, 6]}, {3, 8, f[3, 8]}, {3,
10, f[3, 10]}}, {{7, 1, f[7, 1]}, {7, 6, f[7, 6]}, {7, 8,
f[7, 8]}, {7, 10, f[7, 10]}}}