Finding the Third Proportional to 216,891 and 324,184.50

Step by Step Solution

1. Step 1: Write the proportion equation
   216,891 : 324,184.50 = 324,184.50 : x
2. Step 2: Convert to fraction form
   216,891/324,184.50 = 324,184.50/x
3. Step 3: Cross multiply
   216,891x = 324,184.50 × 324,184.50
4. Step 4: Simplify right side
   216,891x = 105,095,590,040.25
5. Step 5: Solve for x
   x = 105,095,590,040.25/216,891
6. Step 6: Final answer
   x = 484,554.87