Show that any positive number M can be represented by (1 + x) / (1 - x),

Question:

Show that any positive number M can be represented by (1 + x) / (1 - x), where x lies within the interval of convergence of the series of Problem 11. Hence conclude that the natural logarithm of any positive number can be found by means of this series. Find in 8 this way to three decimal places?