A checkbook balance is a calculation that is the sum of all checks issued, but not necessarily cashed. The bank statement will often differ because not all checks issued may have been cashed and subtracted from the account. Also, the checkbook will not contain bank charges, so to reconcile the balance, these charges must be accounted for. They will appear in the bank statement. Interest paid into the bank will also be omitted in the checkbook, as will bank charges, but these will show in the bank statement. Deposits would normally be recorded in the checkbook, but while in transit they will not be on the bank statement. A reconciled balance must be supported by relevant documentation.
So let’s look at the facts given in the question and work towards a reconciled balance.
First, unreconciled checks: $1190.17. If we add this amount to the checkbook balance we get $3400.72.
Next, interest was added to the account: 3400.72+42.33=$3443.05.
The bank collected $2000 but made a charge of $5, so $1995 would be added to the account: $5438.05.
Bank service charge reduces the balance: $5423.06.
The checkbook will record the deposits but, until the bank receives them, they cannot be reconciled, so we must deduct them from the calculation: $4812.18.
The company appears to have recorded $400 instead of $300 for an issued check that was cashed, so there is an error of $100 which needs to be added: $4912.18. This reconciled amount differs from the bank statement by $6.