Finding the Third Proportional to 12,987 and 28,447

Step by Step Solution

1. Step 1: Write the proportion equation
   12,987 : 28,447 = 28,447 : x
2. Step 2: Convert to fraction form
   12,987/28,447 = 28,447/x
3. Step 3: Cross multiply
   12,987x = 28,447 × 28,447
4. Step 4: Simplify right side
   12,987x = 809,231,809
5. Step 5: Solve for x
   x = 809,231,809/12,987
6. Step 6: Final answer
   x = 62,310.91