Uber Eats is preparing to split circular food packages into equal-sized portions for couriers. Each package is defined by its radius (packageRadii). The goal is to determine the maximum possible area of a single portion when exactly portionCount equal portions are required in total.

• Each portion must come entirely from
• The area of a circular package with radius r is calculated as π × r × r.
• Use 3.14159265359 as the value of π.
• The answer is accepted if the absolute error is within 0.1.
• The result must be returned as a string, rounded to four decimal places.