Can you find a five digit number which when you place a 7 at the（接上）beginning to make a new number is 4 times larger than when you place the 7 at the end?求翻译和解题过程

Can you find a five digit number which when you place a 7 at the
（接上）beginning to make a new number is 4 times larger than when you place the 7 at the end?
求翻译和解题过程