Finding the Third Proportional to 315,590 and 443,900

Step by Step Solution

1. Step 1: Write the proportion equation
   315,590 : 443,900 = 443,900 : x
2. Step 2: Convert to fraction form
   315,590/443,900 = 443,900/x
3. Step 3: Cross multiply
   315,590x = 443,900 × 443,900
4. Step 4: Simplify right side
   315,590x = 197,047,210,000
5. Step 5: Solve for x
   x = 197,047,210,000/315,590
6. Step 6: Final answer
   x = 624,377.23