Half-life problem? How long ago did this man die?

In 1991 the body of a man was found in melting snow in the Alps of Northern Italy. An examination of the tissue revealed that 46% of the carbon-14 present in his body at the time of his death had decayed. The half-life of carbon-14 is approximately 5728 years. How long ago did this man die? Please help, and explain, thank you.