Finding the Third Proportional to 10,280 and 21,040

Step by Step Solution

1. Step 1: Write the proportion equation
   10,280 : 21,040 = 21,040 : x
2. Step 2: Convert to fraction form
   10,280/21,040 = 21,040/x
3. Step 3: Cross multiply
   10,280x = 21,040 × 21,040
4. Step 4: Simplify right side
   10,280x = 442,681,600
5. Step 5: Solve for x
   x = 442,681,600/10,280
6. Step 6: Final answer
   x = 43,062.41