Finding the Third Proportional to 457,906 and 673,139

Step by Step Solution

1. Step 1: Write the proportion equation
   457,906 : 673,139 = 673,139 : x
2. Step 2: Convert to fraction form
   457,906/673,139 = 673,139/x
3. Step 3: Cross multiply
   457,906x = 673,139 × 673,139
4. Step 4: Simplify right side
   457,906x = 453,116,113,321
5. Step 5: Solve for x
   x = 453,116,113,321/457,906
6. Step 6: Final answer
   x = 989,539.59