Finding the Third Proportional to 15,120 and 21,504

Step by Step Solution

1. Step 1: Write the proportion equation
   15,120 : 21,504 = 21,504 : x
2. Step 2: Convert to fraction form
   15,120/21,504 = 21,504/x
3. Step 3: Cross multiply
   15,120x = 21,504 × 21,504
4. Step 4: Simplify right side
   15,120x = 462,422,016
5. Step 5: Solve for x
   x = 462,422,016/15,120
6. Step 6: Final answer
   x = 30,583.47