Hello, Crossfire!

Answer: .The answers below are correct even though the mutiplications are weird.

What is the last answer?

Code:12 23 34 45 x 34 x 45 x 56 x 67 ---- ---- ---- ---- 1013 2003 2663 ????

The first multiplication is in base-5: .

The second is in base- 6: .

The third is in base-7: .

The fourth is in base-8: .