Finding the Third Proportional to 21,640 and 28,936

Step by Step Solution

1. Step 1: Write the proportion equation
   21,640 : 28,936 = 28,936 : x
2. Step 2: Convert to fraction form
   21,640/28,936 = 28,936/x
3. Step 3: Cross multiply
   21,640x = 28,936 × 28,936
4. Step 4: Simplify right side
   21,640x = 837,292,096
5. Step 5: Solve for x
   x = 837,292,096/21,640
6. Step 6: Final answer
   x = 38,691.87