Finding the Third Proportional to 217,665 and 336,334.50

Step by Step Solution

1. Step 1: Write the proportion equation
   217,665 : 336,334.50 = 336,334.50 : x
2. Step 2: Convert to fraction form
   217,665/336,334.50 = 336,334.50/x
3. Step 3: Cross multiply
   217,665x = 336,334.50 × 336,334.50
4. Step 4: Simplify right side
   217,665x = 113,120,895,890.25
5. Step 5: Solve for x
   x = 113,120,895,890.25/217,665
6. Step 6: Final answer
   x = 519,701.82