Math: Percent that number is between two numbers

How can I figure out what percentage that one number is between two other numbers?

For example, the price of Commodity X is currently $12.34 per pound.
This week's low price was $11.11 per pound and this week's high price was $22.22 per pound.

I tried solving this with JavaScript but I have the math wrong:

var low = 11.11;
var high = 22.22;
var current = 12.34;
alert( current * low / high ); // This is not correct

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