Finding the Third Proportional to 457,910 and 673,142

Step by Step Solution

1. Step 1: Write the proportion equation
   457,910 : 673,142 = 673,142 : x
2. Step 2: Convert to fraction form
   457,910/673,142 = 673,142/x
3. Step 3: Cross multiply
   457,910x = 673,142 × 673,142
4. Step 4: Simplify right side
   457,910x = 453,120,152,164
5. Step 5: Solve for x
   x = 453,120,152,164/457,910
6. Step 6: Final answer
   x = 989,539.76