The result of your conversion between cuerda and cawney appears here
To convert between Cuerda and Cawney you have to do the following:
First divide 3930 / (4/3) * (0.09290304*43560) = 0.72834311
Then multiply the amount of Cuerda you want to convert to Cawney, use the chart below to guide you.
Symbol: cda
No description
Symbol: cawney
No description