Finding the Third Proportional to 131,478 and 287,496

Step by Step Solution

1. Step 1: Write the proportion equation
   131,478 : 287,496 = 287,496 : x
2. Step 2: Convert to fraction form
   131,478/287,496 = 287,496/x
3. Step 3: Cross multiply
   131,478x = 287,496 × 287,496
4. Step 4: Simplify right side
   131,478x = 82,653,950,016
5. Step 5: Solve for x
   x = 82,653,950,016/131,478
6. Step 6: Final answer
   x = 628,652.32