Finding the Third Proportional to 9,878 and 21,396

Step by Step Solution

1. Step 1: Write the proportion equation
   9,878 : 21,396 = 21,396 : x
2. Step 2: Convert to fraction form
   9,878/21,396 = 21,396/x
3. Step 3: Cross multiply
   9,878x = 21,396 × 21,396
4. Step 4: Simplify right side
   9,878x = 457,788,816
5. Step 5: Solve for x
   x = 457,788,816/9,878
6. Step 6: Final answer
   x = 46,344.28