The last row is an imaginary cash flow which corresponds to the value of the security at the current date. It is the cash flow you would have if you sold the remaining investment for its value. It is entered as positive because you are getting money out of the investment. The first column is the number of days each cash flow occurs before the current date. The second column is the amount of the cash flow.
Money coming into the investment is negative, and money obtained from the investment is positive.
The third column is the first column expressed in years. The result figure is the ratio by which that item of cash flow will change from its date of occurrence to the current date when increased at the estimated annual rate. Note that if you subtract 1.0 from that figure, you have the Total Return for that item of cash flow at that interest rate. The fifth column is the fourth column times the amount of the cash flow. It is the projected value of each cash flow as of the current date.