Translations for reasonably in French

Here are paragraphs from public domain books translated:

But when the time came to pay for his rosemary, this oil, and the wine, the only expense the master had incurred, as he had preserved a strict abstinence--while on the contrary, the yellow horse, by the account of the hostler at least, had eaten three times as much as a horse of his size could reasonably supposed to have done--d'Artagnan found nothing in his pocket but his little old velvet purse with the eleven crowns it contained; for as to the letter addressed to M. de Treville, it had disappeared.

Mais au moment de payer ce romarin, cette huile et ce vin, seule dépense du maître qui avait gardé une diète absolue, tandis qu’au contraire le cheval jaune, au dire de l’hôtelier du moins, avait mangé trois fois plus qu’on n’eût raisonnablement pu le supposer pour sa taille, d’Artagnan ne trouva plus dans sa poche que sa petite bourse de velours râpé ainsi que les onze écus qu’elle contenait ; mais quant à la lettre adressée à M. de Tréville, elle avait disparu.

The Three Musketeers, by Alexandre Dumas

Les Trois Mousquetaires, de Alexandre Dumas