Finding the Third Proportional to 10,190 and 21,790

Step by Step Solution

1. Step 1: Write the proportion equation
   10,190 : 21,790 = 21,790 : x
2. Step 2: Convert to fraction form
   10,190/21,790 = 21,790/x
3. Step 3: Cross multiply
   10,190x = 21,790 × 21,790
4. Step 4: Simplify right side
   10,190x = 474,804,100
5. Step 5: Solve for x
   x = 474,804,100/10,190
6. Step 6: Final answer
   x = 46,595.10