Finding the Third Proportional to 12,640 and 17,790

Step by Step Solution

1. Step 1: Write the proportion equation
   12,640 : 17,790 = 17,790 : x
2. Step 2: Convert to fraction form
   12,640/17,790 = 17,790/x
3. Step 3: Cross multiply
   12,640x = 17,790 × 17,790
4. Step 4: Simplify right side
   12,640x = 316,484,100
5. Step 5: Solve for x
   x = 316,484,100/12,640
6. Step 6: Final answer
   x = 25,038.30