Finding the Third Proportional to 21,080 and 30,640

Step by Step Solution

1. Step 1: Write the proportion equation
   21,080 : 30,640 = 30,640 : x
2. Step 2: Convert to fraction form
   21,080/30,640 = 30,640/x
3. Step 3: Cross multiply
   21,080x = 30,640 × 30,640
4. Step 4: Simplify right side
   21,080x = 938,809,600
5. Step 5: Solve for x
   x = 938,809,600/21,080
6. Step 6: Final answer
   x = 44,535.56