Finding the Third Proportional to 218,307 and 326,119.50

Step by Step Solution

1. Step 1: Write the proportion equation
   218,307 : 326,119.50 = 326,119.50 : x
2. Step 2: Convert to fraction form
   218,307/326,119.50 = 326,119.50/x
3. Step 3: Cross multiply
   218,307x = 326,119.50 × 326,119.50
4. Step 4: Simplify right side
   218,307x = 106,353,928,280.25
5. Step 5: Solve for x
   x = 106,353,928,280.25/218,307
6. Step 6: Final answer
   x = 487,175.99