Finding the Third Proportional to 457,239 and 679,237.50

Step by Step Solution

1. Step 1: Write the proportion equation
   457,239 : 679,237.50 = 679,237.50 : x
2. Step 2: Convert to fraction form
   457,239/679,237.50 = 679,237.50/x
3. Step 3: Cross multiply
   457,239x = 679,237.50 × 679,237.50
4. Step 4: Simplify right side
   457,239x = 461,363,581,406.25
5. Step 5: Solve for x
   x = 461,363,581,406.25/457,239
6. Step 6: Final answer
   x = 1,009,020.62