Finding the Third Proportional to 218,658 and 337,326.75

Step by Step Solution

1. Step 1: Write the proportion equation
   218,658 : 337,326.75 = 337,326.75 : x
2. Step 2: Convert to fraction form
   218,658/337,326.75 = 337,326.75/x
3. Step 3: Cross multiply
   218,658x = 337,326.75 × 337,326.75
4. Step 4: Simplify right side
   218,658x = 113,789,336,265.56
5. Step 5: Solve for x
   x = 113,789,336,265.56/218,658
6. Step 6: Final answer
   x = 520,398.69