Finding the Third Proportional to 8,600 and 12,428

Step by Step Solution

1. Step 1: Write the proportion equation
   8,600 : 12,428 = 12,428 : x
2. Step 2: Convert to fraction form
   8,600/12,428 = 12,428/x
3. Step 3: Cross multiply
   8,600x = 12,428 × 12,428
4. Step 4: Simplify right side
   8,600x = 154,455,184
5. Step 5: Solve for x
   x = 154,455,184/8,600
6. Step 6: Final answer
   x = 17,959.91