What is 5-1 times 4 plus 78 divided by 9 times 46 plus 783 minus 66 times 54?

1) A (pocket) calculator certificate would be helpful, wouldn't it?
2) In order to be able to help you, you should try using brackets. It is quite a difference between e.g. :

(5 - 1) * 4 + 78 ... = 94 ...

and

(5 - 1) * (4 + 78) ... = 4 * 82 ... = 328 ...