Finding the Third Proportional to 8,558 and 10,430

Step by Step Solution

1. Step 1: Write the proportion equation
   8,558 : 10,430 = 10,430 : x
2. Step 2: Convert to fraction form
   8,558/10,430 = 10,430/x
3. Step 3: Cross multiply
   8,558x = 10,430 × 10,430
4. Step 4: Simplify right side
   8,558x = 108,784,900
5. Step 5: Solve for x
   x = 108,784,900/8,558
6. Step 6: Final answer
   x = 12,711.49