Finding the Third Proportional to 15,680.25 and 21,978

Step by Step Solution

1. Step 1: Write the proportion equation
   15,680.25 : 21,978 = 21,978 : x
2. Step 2: Convert to fraction form
   15,680.25/21,978 = 21,978/x
3. Step 3: Cross multiply
   15,680.25x = 21,978 × 21,978
4. Step 4: Simplify right side
   15,680.25x = 483,032,484
5. Step 5: Solve for x
   x = 483,032,484/15,680.25
6. Step 6: Final answer
   x = 30,805.15