Finding the Third Proportional to 5,128 and 10,620

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128 : 10,620 = 10,620 : x
2. Step 2: Convert to fraction form
   5,128/10,620 = 10,620/x
3. Step 3: Cross multiply
   5,128x = 10,620 × 10,620
4. Step 4: Simplify right side
   5,128x = 112,784,400
5. Step 5: Solve for x
   x = 112,784,400/5,128
6. Step 6: Final answer
   x = 21,993.84