Finding the Third Proportional to 289,940 and 443,522

Step by Step Solution

1. Step 1: Write the proportion equation
   289,940 : 443,522 = 443,522 : x
2. Step 2: Convert to fraction form
   289,940/443,522 = 443,522/x
3. Step 3: Cross multiply
   289,940x = 443,522 × 443,522
4. Step 4: Simplify right side
   289,940x = 196,711,764,484
5. Step 5: Solve for x
   x = 196,711,764,484/289,940
6. Step 6: Final answer
   x = 678,456.80