Note 401 — Chapter VI
Reading edition
My calculation works out as follows. Each of 10 seats was 38 palms long: total length, 380 palms. As these 10 seats cost 130 ducats, each palm cost 130/380 ducats = 1/3 a ducat nearly.
As the total paid was 300 ducats, this first payment, viz. 130 ducats, left 170 ducats still due for the 15 remaining seats. As each palm cost a third of a ducat, 170 ducats would buy 510 palms = 113·73 metres = 4477 inches (nearly) = 373 feet.