Finding the Third Proportional to 20,239 and 30,640

Step by Step Solution

1. Step 1: Write the proportion equation
   20,239 : 30,640 = 30,640 : x
2. Step 2: Convert to fraction form
   20,239/30,640 = 30,640/x
3. Step 3: Cross multiply
   20,239x = 30,640 × 30,640
4. Step 4: Simplify right side
   20,239x = 938,809,600
5. Step 5: Solve for x
   x = 938,809,600/20,239
6. Step 6: Final answer
   x = 46,386.17