En un principio parece te quedaría poner la coma a esa cadena y luego aplicar la función FloatToStr(X).
Cita:
Unit
Sysutils
Category
floating point conversion routines
function StrToFloat(const S: string): Extended;
Description
Use StrToFloat to convert a string, S, to a floating-point value. S must consist of an optional sign (+ or -), a string of digits with an optional decimal point, and an optional mantissa. The mantissa consists of 'E' or 'e' followed by an optional sign (+ or -) and a whole number. Leading and trailing blanks are ignored.
The DecimalSeparator global variable defines the character that must be used as a decimal point. Thousand separators and currency symbols are not allowed in the string. If S doesn't contain a valid value, StrToFloat raises an EConvertError exception.
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Un Saludo.