Finding the Third Proportional to 289,930 and 443,506

Step by Step Solution

1. Step 1: Write the proportion equation
   289,930 : 443,506 = 443,506 : x
2. Step 2: Convert to fraction form
   289,930/443,506 = 443,506/x
3. Step 3: Cross multiply
   289,930x = 443,506 × 443,506
4. Step 4: Simplify right side
   289,930x = 196,697,572,036
5. Step 5: Solve for x
   x = 196,697,572,036/289,930
6. Step 6: Final answer
   x = 678,431.25