Converting ready to use wpf project to Cross platform development for via MVVM pattern or web technologies

This project is for ready to use WPF project to convert to cross platform via MVVM pattern. Project has written in C#, .Net framework 4.0, Webservice based MSSQL commnunication. now, we would like to use it via mobile application (ios, android, windows phone) and mobile/web browser. Project may not need to MVVM. But company/freelancer must suggest a solution to convert it fastly, securely and easily. If company/freelancer prefer to use MVVM pattern, which pattern will be used, why will be used, must be explain. We will give web service connection and project c# codes in pieces. c# codes ready to use and written in class based and event driven via web service. Most of time just copy paste coding. Company/freelancer must work on html5 responsive design for application MENU woring on web/mobile browser. We will send project screenshots who interested in this project. Project has 13 main module. Each module has min. 4 or max. 20 sub menus for containing insert, update, delete mechanism. We are waiting suggestion ways firstly. After sharing screenshots, waiting final budget and time. We would like to see a demo MVVM application or a solution example before starting project. For first step bid, we will share a piece of code to get working example. Second step and other bids will be divided into project steps. Thank you for your interest. Sincerely.