Finding the Third Proportional to 320,880 and 498,870

Step by Step Solution

1. Step 1: Write the proportion equation
   320,880 : 498,870 = 498,870 : x
2. Step 2: Convert to fraction form
   320,880/498,870 = 498,870/x
3. Step 3: Cross multiply
   320,880x = 498,870 × 498,870
4. Step 4: Simplify right side
   320,880x = 248,871,276,900
5. Step 5: Solve for x
   x = 248,871,276,900/320,880
6. Step 6: Final answer
   x = 775,589.87