[plt-scheme] C-style Printf Format Convention?

Is there a PLT string format function that works like
the C printf?

My goal is to be able to print a number with an
arbitrary
number of digits, regardless of its actual magnitude:

e.g.,:

printf("%-10.5d", 1.23);

=> 1.2300

Is there a formatting utility I can use for this?

Thanks,

-Brent