Finding the Third Proportional to 663,440 and 998,488

Step by Step Solution

1. Step 1: Write the proportion equation
   663,440 : 998,488 = 998,488 : x
2. Step 2: Convert to fraction form
   663,440/998,488 = 998,488/x
3. Step 3: Cross multiply
   663,440x = 998,488 × 998,488
4. Step 4: Simplify right side
   663,440x = 996,978,286,144
5. Step 5: Solve for x
   x = 996,978,286,144/663,440
6. Step 6: Final answer
   x = 1,502,740.69