Finding the Third Proportional to 15,686.16 and 21,940.24

Step by Step Solution

1. Step 1: Write the proportion equation
   15,686.16 : 21,940.24 = 21,940.24 : x
2. Step 2: Convert to fraction form
   15,686.16/21,940.24 = 21,940.24/x
3. Step 3: Cross multiply
   15,686.16x = 21,940.24 × 21,940.24
4. Step 4: Simplify right side
   15,686.16x = 481,374,227.25
5. Step 5: Solve for x
   x = 481,374,227.25/15,686.16
6. Step 6: Final answer
   x = 30,687.84