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I would work at it in a different way.
17(.06) = 89x
x = .01146
y (.01146) = 92.95
y = 8111 green stones
Your second equation should be:
1549/17 = X/89 since 17 ox horns = 89 green stones.
X = 8109
The difference is due to rounding error.
I hope this helps. Thanks for asking.