John is planning to retire in $15$ years. Money can be deposited at $8\%$ compounded quarterly. What quarterly amount must be deposited at the end of each quarter until John retires so that he can make a withdrawal of $$23,457$ semi$-$annually over the first $5$ years of his retirement. Assume that John's first withdrawal occurs at the end of six months after his retirement. Please do it correct carefully and show steps. Posting this for $4$th time. Round it to $2$ decimal places