Finding the Third Proportional to 298,811 and 442,870

Step by Step Solution

1. Step 1: Write the proportion equation
   298,811 : 442,870 = 442,870 : x
2. Step 2: Convert to fraction form
   298,811/442,870 = 442,870/x
3. Step 3: Cross multiply
   298,811x = 442,870 × 442,870
4. Step 4: Simplify right side
   298,811x = 196,133,836,900
5. Step 5: Solve for x
   x = 196,133,836,900/298,811
6. Step 6: Final answer
   x = 656,380.91