How to Handle currency conversion while updating a Money field using FetchXml Aggregate

I am trying to Update Quote Total from the Sum of Quote detail Prices using FetchXml Aggregate.

Suppose my Quote's Transaction currency is EURO and Organization Base currency is USD.

I noticed that Fetxchml aggregate is always returning the total in USD (standard behavior) or personal preference. So if I try to update the Quote Total(EURO) its always ending up in wrong value. But is there a way to return the total in EURO and update it back in EURO so as to ensure its always correct. Below is my code:

Entity parent = (Entity)Context.PreEntityImages["PreImage"];

decimal Total = FetchResult(parent.Id, Service);

Entity quote = new Entity("quote");

quote.Id = parent.Id;

quote["fpig_quotegrossprofit"] = new Money (Total);

Service.Update(quote);

private static decimal FetchResult(Guid parent, IOrganizationService service)

       {

             string quoteref = parent.ToString();

               string value_sum = string.Format(@"<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false' aggregate='true'>

<entity name='quotedetail'>

<attribute name='fpig_grossprofit' alias='totalamount_sum' aggregate='sum'/>

<filter type='and'>

     <condition attribute='quoteid' operator='eq' uitype='quote' value = '{0}' />

   </filter>

</entity>

</fetch>", quoteref);

               decimal aggregate2 = 0;

 EntityCollection value_sum_result = (EntityCollection)service.RetrieveMultiple(new FetchExpression(value_sum));

               foreach (var c in value_sum_result.Entities)

               {

                   AliasedValue a = (AliasedValue)c["totalamount_sum"];

                   if (a.Value != null)

                   {

                       aggregate2 = ((Money)a.Value).Value;

                        }

               }

             return aggregate2;

       }

   }