Finding the Third Proportional to 222,900 and 434,638

Step by Step Solution

1. Step 1: Write the proportion equation
   222,900 : 434,638 = 434,638 : x
2. Step 2: Convert to fraction form
   222,900/434,638 = 434,638/x
3. Step 3: Cross multiply
   222,900x = 434,638 × 434,638
4. Step 4: Simplify right side
   222,900x = 188,910,191,044
5. Step 5: Solve for x
   x = 188,910,191,044/222,900
6. Step 6: Final answer
   x = 847,510.95