Finding the Third Proportional to 289,938 and 443,519

Step by Step Solution

1. Step 1: Write the proportion equation
   289,938 : 443,519 = 443,519 : x
2. Step 2: Convert to fraction form
   289,938/443,519 = 443,519/x
3. Step 3: Cross multiply
   289,938x = 443,519 × 443,519
4. Step 4: Simplify right side
   289,938x = 196,709,103,361
5. Step 5: Solve for x
   x = 196,709,103,361/289,938
6. Step 6: Final answer
   x = 678,452.30