Finding the Third Proportional to 17,631 and 38,420

Step by Step Solution

1. Step 1: Write the proportion equation
   17,631 : 38,420 = 38,420 : x
2. Step 2: Convert to fraction form
   17,631/38,420 = 38,420/x
3. Step 3: Cross multiply
   17,631x = 38,420 × 38,420
4. Step 4: Simplify right side
   17,631x = 1,476,096,400
5. Step 5: Solve for x
   x = 1,476,096,400/17,631
6. Step 6: Final answer
   x = 83,721.65