Finding the Third Proportional to 10,131 and 21,378

Step by Step Solution

1. Step 1: Write the proportion equation
   10,131 : 21,378 = 21,378 : x
2. Step 2: Convert to fraction form
   10,131/21,378 = 21,378/x
3. Step 3: Cross multiply
   10,131x = 21,378 × 21,378
4. Step 4: Simplify right side
   10,131x = 457,018,884
5. Step 5: Solve for x
   x = 457,018,884/10,131
6. Step 6: Final answer
   x = 45,110.94