Finding the Third Proportional to 392,815.50 and 627,618

Step by Step Solution

1. Step 1: Write the proportion equation
   392,815.50 : 627,618 = 627,618 : x
2. Step 2: Convert to fraction form
   392,815.50/627,618 = 627,618/x
3. Step 3: Cross multiply
   392,815.50x = 627,618 × 627,618
4. Step 4: Simplify right side
   392,815.50x = 393,904,353,924
5. Step 5: Solve for x
   x = 393,904,353,924/392,815.50
6. Step 6: Final answer
   x = 1,002,771.92