Your residual is the BMW Factory rate and your finance charge as quoted appears to be even lower than the BMW factory rate (equivalent to approx. 5.76%) for a 36 month/12k lease on the X5 35d:
http://www.bimmerfest.com/forums/sho...d.php?t=438355
Nevertheless, I get $828.71 for the monthly payment using your negotiated price and the factory lease rates. Using your money factor, I get $713.56.
You can use the lease calculator here to calculate a lease payment when all variables are known.
http://www.leaseguide.com/calc.htm