#
Golden ratio
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Show that the golden ratio φ (section 1.2.2) is a fixed point of the transformation x → 1 + 1/x, and use this fact to compute φ by means of the fixed-point procedure.

```
(define tolerance 0.00001)
(define (fixed-point f first-guess)
(define (close-enough? v1 v2)
(< (abs (- v1 v2)) tolerance))
(define (try guess)
(let ((next (f guess)))
(if (close-enough? guess next)
next
(try next))))
(try first-guess))
(check-equal? (round (* 10000 (fixed-point solution 1.0))) 16180.0)
```