Your grandfather started his own business 52 years ago. He opened a savings account at the end of his third month of business and contributed $x. Every three months since then, he faithfully saved another $x. His savings account has earned an average rate of 4.5 percent annually. Today, his account is valued at $364,209.11. How much did your grandfather save every three months?

a) $425.15

b) $428.67

c) $431.09

d) $443.13

e) $462.25