$4,281.19
Explanation:
The standard notation equation is P = F(P/F, i, n) where the value of the factor is seen in the compound interest factor table.
Let the amount deposited in year 4 be A, we calculate the value of A as follows
10,000 = 2A(P/F, 10%, 2) + A(P/F, 10%, 4)
10,000 = 2A(0.8263) + A(0.683)
2.3358A = 10,000
A = 10,000 / 2.3358
A = 4281.188457915917
A = $4,281.19.