Finding the Third Proportional to 443,678 and 665,300

Step by Step Solution

1. Step 1: Write the proportion equation
   443,678 : 665,300 = 665,300 : x
2. Step 2: Convert to fraction form
   443,678/665,300 = 665,300/x
3. Step 3: Cross multiply
   443,678x = 665,300 × 665,300
4. Step 4: Simplify right side
   443,678x = 442,624,090,000
5. Step 5: Solve for x
   x = 442,624,090,000/443,678
6. Step 6: Final answer
   x = 997,624.61