first you can get total balance of the address here
https://blockchain.info/q/addressbalance/<insert address>
this will give you balance in satoshis.
so divide it by 100,000,000 to get how many bitcoin you have
and then you can get the dollar price of a whole bitcoin
https://blockchain.info/q/24hrpriceand do the math to get dollar value of balance
balance * price
then you do the math of your target
(100 / target) * dollar balance
and then use any common website progress bar code for the code that the front end (user) will see