Finding the Third Proportional to 10,890 and 16,521.75

Step by Step Solution

1. Step 1: Write the proportion equation
   10,890 : 16,521.75 = 16,521.75 : x
2. Step 2: Convert to fraction form
   10,890/16,521.75 = 16,521.75/x
3. Step 3: Cross multiply
   10,890x = 16,521.75 × 16,521.75
4. Step 4: Simplify right side
   10,890x = 272,968,223.06
5. Step 5: Solve for x
   x = 272,968,223.06/10,890
6. Step 6: Final answer
   x = 25,065.95