Finding the Third Proportional to 222,800 and 321,912

Step by Step Solution

1. Step 1: Write the proportion equation
   222,800 : 321,912 = 321,912 : x
2. Step 2: Convert to fraction form
   222,800/321,912 = 321,912/x
3. Step 3: Cross multiply
   222,800x = 321,912 × 321,912
4. Step 4: Simplify right side
   222,800x = 103,627,335,744
5. Step 5: Solve for x
   x = 103,627,335,744/222,800
6. Step 6: Final answer
   x = 465,113.72