Finding the Third Proportional to 217,686 and 336,364.50

Step by Step Solution

1. Step 1: Write the proportion equation
   217,686 : 336,364.50 = 336,364.50 : x
2. Step 2: Convert to fraction form
   217,686/336,364.50 = 336,364.50/x
3. Step 3: Cross multiply
   217,686x = 336,364.50 × 336,364.50
4. Step 4: Simplify right side
   217,686x = 113,141,076,860.25
5. Step 5: Solve for x
   x = 113,141,076,860.25/217,686
6. Step 6: Final answer
   x = 519,744.39