What is the Du`a(supplication) of Istikhara(guidance prayer)?

Answer:
O Allah, I consult You as You are All-Knowing and I appeal to You to give me power as You are Omnipotent, I ask You for Your great favor, for You have power and I do not, and You know all of the hidden matters . O Allah ! If you know that this matter (then he should mention it) is good for me in my religion, my livelihood, and for my life in the Hereafter, (or he said: ‘for my present and future life,’) then make it (easy) for me. And if you know that this matter is not good for me in my religion, my livelihood and my life in the Hereafter, (or he said: ‘for my present and future life,’) then keep it away from me and take me away from it and choose what is good for me wherever it is and please me with it.”