Finding the Third Proportional to 20,648 and 31,640

Step by Step Solution

1. Step 1: Write the proportion equation
   20,648 : 31,640 = 31,640 : x
2. Step 2: Convert to fraction form
   20,648/31,640 = 31,640/x
3. Step 3: Cross multiply
   20,648x = 31,640 × 31,640
4. Step 4: Simplify right side
   20,648x = 1,001,089,600
5. Step 5: Solve for x
   x = 1,001,089,600/20,648
6. Step 6: Final answer
   x = 48,483.61