financial mathematics

please be super explicit with the procedure

Alberto wants to buy a car in 10 years. This car costs $200,000 today, but its price increases by 4% each year. To finance this purchase, Alberto deposits $20,000 into an account at the beginning of each year for six years. He deposits an additional $X at the beginning of the fourth, fifth, and sixth years. The annual effective interest rate is 10%. What is the value of X