Finding the Third Proportional to 218,770 and 337,488

Step by Step Solution

1. Step 1: Write the proportion equation
   218,770 : 337,488 = 337,488 : x
2. Step 2: Convert to fraction form
   218,770/337,488 = 337,488/x
3. Step 3: Cross multiply
   218,770x = 337,488 × 337,488
4. Step 4: Simplify right side
   218,770x = 113,898,150,144
5. Step 5: Solve for x
   x = 113,898,150,144/218,770
6. Step 6: Final answer
   x = 520,629.66