Build web/iOS/Andriod App with responsive charts based on data

First I will need a prototype of the web app I want before committing to work with you to make sure you can do what I and my business partners need. It will start out asking what is income, and then lifestyle(expenses). Then a multi series area graph will appear graphing the answers of income, lifestyle(expenses), and wealth(income minus expenses). I want the graphics to look like the phones on the [login to view URL] app. I need it to be responsive, where i can drag my mouse up and down the graph, resulting in a change of numbers being displayed. Later, you will be creating a web, iOS, and Android app. You will need to include data from some other sites to compare the input data with averages based on the site data.