Finding the Third Proportional to 639,488 and 938,496

Step by Step Solution

1. Step 1: Write the proportion equation
   639,488 : 938,496 = 938,496 : x
2. Step 2: Convert to fraction form
   639,488/938,496 = 938,496/x
3. Step 3: Cross multiply
   639,488x = 938,496 × 938,496
4. Step 4: Simplify right side
   639,488x = 880,774,742,016
5. Step 5: Solve for x
   x = 880,774,742,016/639,488
6. Step 6: Final answer
   x = 1,377,312.38