Finding the Third Proportional to 218,868 and 470,430

Step by Step Solution

1. Step 1: Write the proportion equation
   218,868 : 470,430 = 470,430 : x
2. Step 2: Convert to fraction form
   218,868/470,430 = 470,430/x
3. Step 3: Cross multiply
   218,868x = 470,430 × 470,430
4. Step 4: Simplify right side
   218,868x = 221,304,384,900
5. Step 5: Solve for x
   x = 221,304,384,900/218,868
6. Step 6: Final answer
   x = 1,011,131.75