Need numerical data from one form, count from another form, to provide a "Total"

Need numerical data from one form, count from another form, to provide a "Total"

I have a form "Events" used for training and outreach scheduling.  There is a field "Total Scheduled Event Hours".

I have a second form "Registered Attendees" with a Decision Field "Attended".  (This field was added to swiftly identify the number of actual attendees from the list of registered attendees.)

I have a third form "Trainings" 
  • with a Lookup Field "Event_Title" that retrieves event title, total scheduled event hours, training topics, and training method (Training_Title, Total_Scheduled_Event_Hours, Event_Purpose, Method_of_Training)
  • with a Formula Field "# Attended" - This needs to be a count from the second form or report, "Registered Attendees", with the Decision Field "Attended" value "True"          Problem #1
  • with a Formula Field "Ttl Training Hours" - This needs to be the product of "Total Scheduled Event Hours" and "# Attended"          Problem #2
Thank you!