To calculate the proportion of equity to debt, we need to look at the total equity and total debt from the financial information provided. From the balance sheet, we see that the total equity (Fonds propres) is 2,342 K€ and the total debt (Dettes) is 601 K€. 

Therefore, the proportion of equity to debt is:

Equity / Debt = 2,342 K€ / 601 K€ ≈ 3.9

So, the proportion of equity to debt is approximately 3.9.