Finding the Third Proportional to 298,096 and 638,848

Step by Step Solution

1. Step 1: Write the proportion equation
   298,096 : 638,848 = 638,848 : x
2. Step 2: Convert to fraction form
   298,096/638,848 = 638,848/x
3. Step 3: Cross multiply
   298,096x = 638,848 × 638,848
4. Step 4: Simplify right side
   298,096x = 408,126,767,104
5. Step 5: Solve for x
   x = 408,126,767,104/298,096
6. Step 6: Final answer
   x = 1,369,111.85