Finding the Third Proportional to 208,911 and 318,262.50

Step by Step Solution

1. Step 1: Write the proportion equation
   208,911 : 318,262.50 = 318,262.50 : x
2. Step 2: Convert to fraction form
   208,911/318,262.50 = 318,262.50/x
3. Step 3: Cross multiply
   208,911x = 318,262.50 × 318,262.50
4. Step 4: Simplify right side
   208,911x = 101,291,018,906.25
5. Step 5: Solve for x
   x = 101,291,018,906.25/208,911
6. Step 6: Final answer
   x = 484,852.49