You probably need to aggregate :
sum([cInsurance Paid Amount])/sum([cService Amount])
If you data is structured properly it is a simple table calculation
then compute down
it returns this
if you data is not structured this way you will need to pivot the data
see the link Pivot Data from Columns to Rows - Tableau
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Nice duh moment for me!
Don't worry, it still happens to me sometimes when the fingers are moving faster than the brain but you know that 10,000 % is just not right