Finding the Third Proportional to 457,907 and 673,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   457,907 : 673,139.50 = 673,139.50 : x
2. Step 2: Convert to fraction form
   457,907/673,139.50 = 673,139.50/x
3. Step 3: Cross multiply
   457,907x = 673,139.50 × 673,139.50
4. Step 4: Simplify right side
   457,907x = 453,116,786,460.25
5. Step 5: Solve for x
   x = 453,116,786,460.25/457,907
6. Step 6: Final answer
   x = 989,538.89