Your image is 5616 pixels wide. You want the enlargement to be 10 ft (120 inches) wide. So, by calculation, without loss of quality in your original image, you'd have to reduce the dpi to 46.8 dpi. I would try to keep your dpi around 100 dpi for best appearance. So, you will have to scale your image up to do so... unless 46.8 dpi works for you and your image won't be viewed up close.