Finding the Third Proportional to 12,128 and 18,790

Step by Step Solution

1. Step 1: Write the proportion equation
   12,128 : 18,790 = 18,790 : x
2. Step 2: Convert to fraction form
   12,128/18,790 = 18,790/x
3. Step 3: Cross multiply
   12,128x = 18,790 × 18,790
4. Step 4: Simplify right side
   12,128x = 353,064,100
5. Step 5: Solve for x
   x = 353,064,100/12,128
6. Step 6: Final answer
   x = 29,111.49