Monthly payment, p = $300
Duration of loan, t = 4 years
Interest rate, r = 7% = 0.07
n = 12, the compounding interval.
The value of the loan is
A = (4 yr)*(12 mo/yr)*($300 per mo) = $14400
Let P = the principal (the amount financed).
Then

n*t = 12*4 = 48
P(1 + 0.07/12)⁴⁸ = 14400
1.3221P = 14400
P = $10,892.14
Answer: $10,892 (nearest dollar)