Finding the Third Proportional to 9,888 and 21,264

Step by Step Solution

1. Step 1: Write the proportion equation
   9,888 : 21,264 = 21,264 : x
2. Step 2: Convert to fraction form
   9,888/21,264 = 21,264/x
3. Step 3: Cross multiply
   9,888x = 21,264 × 21,264
4. Step 4: Simplify right side
   9,888x = 452,157,696
5. Step 5: Solve for x
   x = 452,157,696/9,888
6. Step 6: Final answer
   x = 45,727.92