Finding the Third Proportional to 4,720 and 10,172

Step by Step Solution

1. Step 1: Write the proportion equation
   4,720 : 10,172 = 10,172 : x
2. Step 2: Convert to fraction form
   4,720/10,172 = 10,172/x
3. Step 3: Cross multiply
   4,720x = 10,172 × 10,172
4. Step 4: Simplify right side
   4,720x = 103,469,584
5. Step 5: Solve for x
   x = 103,469,584/4,720
6. Step 6: Final answer
   x = 21,921.52