Final answer:
The proportion of debt in the company's long-term capital structure is approximately 69.28%, calculated by dividing the long-term debt by the sum of the long-term debt and shareholder's equity.
Step-by-step explanation:
To calculate the proportion of debt used in the company's long-term capital structure, we need to sum up the long-term debt and any other debt components that are considered long-term financing. In this case, the long-term debt is $106 million. We typically don't include current liabilities and short-term notes payable in this calculation as they are due within one year. Therefore, the total long-term debt used in the capital structure is $106 million. To find the proportion of debt, we divide this by the sum of the long-term debt and shareholder's equity: $106 million/(106 million + $47 million) = $106 million/$153 million = 0.6928 or 69.28%.
Therefore, the proportion of debt in the company's capital structure is approximately 69.28%.