Finding the Third Proportional to 216,486 and 322,420.50

Step by Step Solution

1. Step 1: Write the proportion equation
   216,486 : 322,420.50 = 322,420.50 : x
2. Step 2: Convert to fraction form
   216,486/322,420.50 = 322,420.50/x
3. Step 3: Cross multiply
   216,486x = 322,420.50 × 322,420.50
4. Step 4: Simplify right side
   216,486x = 103,954,978,820.25
5. Step 5: Solve for x
   x = 103,954,978,820.25/216,486
6. Step 6: Final answer
   x = 480,192.62