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Ruby, 88

def f(n)
n2=Math.log10(n).to_i/3
return '%.3f'% (n/1000**n2)+['',' k',' M',' G'][n2]
end
puts f(9012345678.0)=='9.012 G'

Python, 97

import math
def f(n):
 n2=int(math.log10(n)/3)
 return '%.3f'%(n/1e3**n2)+('',' k',' M',' G')[n2]
print(f(9012345678)=='9.012 G')

PHP, 100

<?php
function f($n){
$n2=(int)(log10($n)/3);
return sprintf('%.3f',$n/1e3**$n2).['',' k',' M',' G'][$n2];
}
var_dump(f(9012345678)=='9.012 G');

JavaScript, 108

function f(n){
let n2=Math.trunc(Math.log10(n)/3);
return (n/1000**n2).toFixed(3)+['',' k',' M',' G'][n2];
}
console.log(f(9012345678)=='9.012 G');

Rust, 125

fn f(n:f64)->String{
let n2=n.log(1e3);
let n=n/1e3f64.powi(n2 as i32);
format!("{:.3}",n)+[""," k"," M"," G"][n2 as usize]
}
fn main(){
println!("{}",f(9012345678e0)=="9.012 G");
}

Nim, 140

import math,strformat
proc f(n:float):string=
 let n2=int log10(n)/3
 let n=n/pow(1e3,float n2)
 return fmt"{n:.3f}"&[""," k"," M"," G"][n2]
echo f(9012345678e0)=="9.012 G"

Dart, 143

import 'dart:math';
String f(double n){
var n2=(log(n)/ln10/3).toInt();
n/=pow(1000,n2);
return n.toStringAsFixed(3)+['',' k',' M',' G'][n2];
}
void main(){
print(f(9012345678)=='9.012 G');
}

D, 151

import std.format,std.math,std.stdio;
string f(real n){
auto n2=cast(int)log10(n)/3;
n/=pow(1e3,n2);
return format("%.3f",n)~[""," k"," M"," G"][n2];
}
void main(){
writeln(f(9012345678)=="9.012 G");
}

C#, 153

using System;
class A{
static string F(double n){
int n2=Convert.ToInt32(Math.Log10(n))/3;
n/=Math.Pow(1e3,n2);
return String.Format("{0:f3}",n)+new[]{""," k"," M"," G"}[n2];
}
static void Main(){
Console.WriteLine(F(9012345678)=="9.012 G");
}
}

Go, 155

package main
import(
"fmt"
"math"
)
func f(n float64)string{
n2:=int(math.Log10(n))/3
n/=math.Pow10(n2*3)
return fmt.Sprintf("%.3f",n)+[]string{""," k"," M"," G"}[n2]
}
func main(){
println(f(9012345678)=="9.012 G")
}