Finding the Third Proportional to 18,870 and 21,366

Step by Step Solution

1. Step 1: Write the proportion equation
   18,870 : 21,366 = 21,366 : x
2. Step 2: Convert to fraction form
   18,870/21,366 = 21,366/x
3. Step 3: Cross multiply
   18,870x = 21,366 × 21,366
4. Step 4: Simplify right side
   18,870x = 456,505,956
5. Step 5: Solve for x
   x = 456,505,956/18,870
6. Step 6: Final answer
   x = 24,192.15