Finding the Third Proportional to 458,310 and 673,417.50

Step by Step Solution

1. Step 1: Write the proportion equation
   458,310 : 673,417.50 = 673,417.50 : x
2. Step 2: Convert to fraction form
   458,310/673,417.50 = 673,417.50/x
3. Step 3: Cross multiply
   458,310x = 673,417.50 × 673,417.50
4. Step 4: Simplify right side
   458,310x = 453,491,129,306.25
5. Step 5: Solve for x
   x = 453,491,129,306.25/458,310
6. Step 6: Final answer
   x = 989,485.57