Finding the Third Proportional to 10,215 and 15,131.25

Step by Step Solution

1. Step 1: Write the proportion equation
   10,215 : 15,131.25 = 15,131.25 : x
2. Step 2: Convert to fraction form
   10,215/15,131.25 = 15,131.25/x
3. Step 3: Cross multiply
   10,215x = 15,131.25 × 15,131.25
4. Step 4: Simplify right side
   10,215x = 228,954,726.56
5. Step 5: Solve for x
   x = 228,954,726.56/10,215
6. Step 6: Final answer
   x = 22,413.58