Finding the Third Proportional to 8,424 and 17,120

Step by Step Solution

1. Step 1: Write the proportion equation
   8,424 : 17,120 = 17,120 : x
2. Step 2: Convert to fraction form
   8,424/17,120 = 17,120/x
3. Step 3: Cross multiply
   8,424x = 17,120 × 17,120
4. Step 4: Simplify right side
   8,424x = 293,094,400
5. Step 5: Solve for x
   x = 293,094,400/8,424
6. Step 6: Final answer
   x = 34,792.78