Finding the Third Proportional to 10,692 and 15,221.25

Step by Step Solution

1. Step 1: Write the proportion equation
   10,692 : 15,221.25 = 15,221.25 : x
2. Step 2: Convert to fraction form
   10,692/15,221.25 = 15,221.25/x
3. Step 3: Cross multiply
   10,692x = 15,221.25 × 15,221.25
4. Step 4: Simplify right side
   10,692x = 231,686,451.56
5. Step 5: Solve for x
   x = 231,686,451.56/10,692
6. Step 6: Final answer
   x = 21,669.14