[Dilettante_Pro]

<script>
var Amount_of_dogovor = "9 692 978 185,70р.";
    Amount_of_dogovor = Amount_of_dogovor.replace(/ /g,''); //Убираю пробелы 
    Amount_of_dogovor = Amount_of_dogovor.replace('р.','');
    Amount_of_dogovor = Amount_of_dogovor.replace(',','.');

    var Test = 100;
    alert(parseFloat(Amount_of_dogovor) + Test);
</script>