Finding the Third Proportional to 315,606 and 443,921

Step by Step Solution

1. Step 1: Write the proportion equation
   315,606 : 443,921 = 443,921 : x
2. Step 2: Convert to fraction form
   315,606/443,921 = 443,921/x
3. Step 3: Cross multiply
   315,606x = 443,921 × 443,921
4. Step 4: Simplify right side
   315,606x = 197,065,854,241
5. Step 5: Solve for x
   x = 197,065,854,241/315,606
6. Step 6: Final answer
   x = 624,404.65