Here's the multipier in each transformation:
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Super Saiyan with Royal Bloodline = x250
Mastered Super Saiyan with royal bloodline = x300
Super Saiyan 2 with Royal Bloodline = x400
Mastered Super Saiyan 2 with royal bloodline = x500
Super Saiyan 3 with Royal Bloodline = x650
Mastered Super Saiyan 3 with royal bloodline = x700
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Super Saiyan = x50
Mastered Super Saiyan = x80
Super Saiyan 2 = x100
Super Saiyan 3 = x400
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Mutated Super Saiyan = 50x10 = x500
Mastered Mutated Super Saiyan = 80x10 = x800
Mutated Super Saiyan 2 = 100x10 = x1,000
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Brolly's super saiyan multipier will be 10x greater than the normal. Since he used the power of great ape without becoming a giant ape (ikari mode) to his super saiyan transformation. Ikari mode has 10x multipier, so he's transformation is greater by 10x. That means his super saiyan 1 multipier is greater that super saiyan 3 goku multipier. I will be calling Brolly's transformation 'Mutated' since all Super Saiyan variant is called legendary form that has been lost for many ages.
(This is not the official multipier since in the series, they did not specify some of the multipier in each transformation. I'm just using this base on my own understanding and some research. I will update this if there's another transformations.)