Finding the Third Proportional to 422,304 and 619,608

Step by Step Solution

1. Step 1: Write the proportion equation
   422,304 : 619,608 = 619,608 : x
2. Step 2: Convert to fraction form
   422,304/619,608 = 619,608/x
3. Step 3: Cross multiply
   422,304x = 619,608 × 619,608
4. Step 4: Simplify right side
   422,304x = 383,914,073,664
5. Step 5: Solve for x
   x = 383,914,073,664/422,304
6. Step 6: Final answer
   x = 909,094.10