Amount you want to exchange = 10,000 euros
spot rate on the dollar/euro cross rate is $1.1878/€
spot rate on the ruble/dollar cross rate is rbl 57.83/$
rubles you will obtain for your euros = ?
ruble/euro = rbl 57.83 x 1.1878 /euro = 68.690474/euro
you have 10,000 euro, so
10,000 x 68.690474 = 686904.74 rbl