Finding the Third Proportional to 8,572 and 18,499

Step by Step Solution

1. Step 1: Write the proportion equation
   8,572 : 18,499 = 18,499 : x
2. Step 2: Convert to fraction form
   8,572/18,499 = 18,499/x
3. Step 3: Cross multiply
   8,572x = 18,499 × 18,499
4. Step 4: Simplify right side
   8,572x = 342,213,001
5. Step 5: Solve for x
   x = 342,213,001/8,572
6. Step 6: Final answer
   x = 39,922.19