Finding the Third Proportional to 20,111 and 30,128

Step by Step Solution

1. Step 1: Write the proportion equation
   20,111 : 30,128 = 30,128 : x
2. Step 2: Convert to fraction form
   20,111/30,128 = 30,128/x
3. Step 3: Cross multiply
   20,111x = 30,128 × 30,128
4. Step 4: Simplify right side
   20,111x = 907,696,384
5. Step 5: Solve for x
   x = 907,696,384/20,111
6. Step 6: Final answer
   x = 45,134.32