Bob takes out a $4$ year mortgage for $$1,025,000$ at an interest rate of i$(26)=5\mathrm{.}750\%.$ The amortization period is $20$ years and he will make weekly payments. After $3$ years the rate changes to i$(26)=4\mathrm{.}875\%.$ What is the outstanding balance at the end of the term $(4$ years$)$ of the mortgage $($taking into account the change in rates!$)?$