If x is added to each of the numbers 5, 11, 3 and 8, the number, so obtained in this order, are in proportion. What is the value of \(\sqrt {\left( {{\rm{x}}\,{\rm{ + }}\,{\rm{2}}} \right)\left( {{\rm{4x}}\,{\rm{ - }}\,{\rm{3}}} \right)} \) ?
1
12
2
15
3
20
4
30