Limit to two decimals in Jquery. Failed toFixed ()

I have a JQUERY code and I can not limit the decimals to two.

This is my code.

$('.cantidax').change(function()

{
    var precio = $(this).parents('td').prev().find('span.amount');
    var total = $(this).parents('td').next().find('span.amount');
    var valorPrecio = parseFloat(precio.text());
    var valorCantidad = parseFloat($(this).val());
    var PrecioxCantidad = valorPrecio * valorCantidad;
    var totales = parseFloat(total.text(PrecioxCantidad));
    var decimales = parseFloat(totales);

    console.log(typeof(valorPrecio));
    console.log(typeof(valorCantidad));
    console.log(typeof(PrecioxCantidad));
    console.log(typeof(totales));
    console.log(typeof(decimales));


});

The html code he works with is this

<td class="product-price">
   <span class="amount">{{$producto->precio}} €</span> 
</td>

 <td class="product-quantity">
<div class="quantity buttons_added">

<input type="number" size="4" class="input-text qty text cantidax"  value="" min="0" step="1" > 

 <a href="" class="btn btn-warning" >
      <i class="fa fa-refresh"></i>
</a>
 </div>
 </td>

<td class="product-subtotal">
       <span class="amount"></span> 
</td>

I have tried to get the type of each variable with console.log (typeof ()) and in all cases the result is number, but if I use toFixed () to delimit decimals, so that.

var decimales = parseFloat(totales).toFixed(2);

The decimals variable and the total variable is converted to NaN. Showing the results are these

       4503.91 
        14 
         63054.74 
        NaN 
        NaN

so the bug is in

var totales = parseFloat(total.text(PrecioxCantidad));      
var decimales = parseFloat(totales);

But I can not see it. What can be failing?