Finding the Third Proportional to 109,208 and 238,621

Step by Step Solution

1. Step 1: Write the proportion equation
   109,208 : 238,621 = 238,621 : x
2. Step 2: Convert to fraction form
   109,208/238,621 = 238,621/x
3. Step 3: Cross multiply
   109,208x = 238,621 × 238,621
4. Step 4: Simplify right side
   109,208x = 56,939,981,641
5. Step 5: Solve for x
   x = 56,939,981,641/109,208
6. Step 6: Final answer
   x = 521,390.21