Finding the Third Proportional to 217,812 and 326,704.50

Step by Step Solution

1. Step 1: Write the proportion equation
   217,812 : 326,704.50 = 326,704.50 : x
2. Step 2: Convert to fraction form
   217,812/326,704.50 = 326,704.50/x
3. Step 3: Cross multiply
   217,812x = 326,704.50 × 326,704.50
4. Step 4: Simplify right side
   217,812x = 106,735,830,320.25
5. Step 5: Solve for x
   x = 106,735,830,320.25/217,812
6. Step 6: Final answer
   x = 490,036.50