I'll use following abbreviations :
ISN (initial sequence number)
SN (sequence number)
AN (acknowledgement number )
Solution :
ISN of sender = 1093
ISN of Receiver = 391
To establish connection one sequence number for each of them would have been eaten up, therefore
next SN to be used for sender = 1094 and for receiver = 392
Now sender will send 1460 Bytes of data with SN=1094 and AN = 392
Receiver will acknowledge the pkt with SN=392 and AN = 1094+1460 = 2554
Hence ack number sent by Receiver will be 2554.