Finding the Third Proportional to 438,740 and 663,510

Step by Step Solution

1. Step 1: Write the proportion equation
   438,740 : 663,510 = 663,510 : x
2. Step 2: Convert to fraction form
   438,740/663,510 = 663,510/x
3. Step 3: Cross multiply
   438,740x = 663,510 × 663,510
4. Step 4: Simplify right side
   438,740x = 440,245,520,100
5. Step 5: Solve for x
   x = 440,245,520,100/438,740
6. Step 6: Final answer
   x = 1,003,431.46