Finding the Third Proportional to 10,120 and 20,740

Step by Step Solution

1. Step 1: Write the proportion equation
   10,120 : 20,740 = 20,740 : x
2. Step 2: Convert to fraction form
   10,120/20,740 = 20,740/x
3. Step 3: Cross multiply
   10,120x = 20,740 × 20,740
4. Step 4: Simplify right side
   10,120x = 430,147,600
5. Step 5: Solve for x
   x = 430,147,600/10,120
6. Step 6: Final answer
   x = 42,504.70