If you move a decimal point one place to the right, it will be 4.86 larger than the original number. What is the original number? My friend's children have problems,

If you move a decimal point one place to the right, it will be 4.86 larger than the original number. What is the original number? My friend's children have problems,

9x=4.86,x=0.54
If the decimal point is moved one place to the right, the number becomes 10 times of the original number, that is, 9 times larger than the original number. If the original number is x, the above formula can be listed