so first step to solving this problem is to multiply and divide the corresponding values
3 x 100 = 300
300 + 6(10) + 8 + 4/100 + 9/1000
6 x 10 = 60
300 + 60 + 8 + 4/100 + 9/1000
4/100 = .04
300 + 60 + 8 + .04 + 9/1000
9/1000 = .009
300 + 60 + 8 + .04 + .009
now add these values together!
300 + 60 + 8 + .04 + .009 = 368.049
if you have any questions about how i solved this problem let me know:)