Finding the Third Proportional to 20,128 and 31,328

Step by Step Solution

1. Step 1: Write the proportion equation
   20,128 : 31,328 = 31,328 : x
2. Step 2: Convert to fraction form
   20,128/31,328 = 31,328/x
3. Step 3: Cross multiply
   20,128x = 31,328 × 31,328
4. Step 4: Simplify right side
   20,128x = 981,443,584
5. Step 5: Solve for x
   x = 981,443,584/20,128
6. Step 6: Final answer
   x = 48,760.11