Finding the Third Proportional to 7,144.88 and 10,990.69

Step by Step Solution

1. Step 1: Write the proportion equation
   7,144.88 : 10,990.69 = 10,990.69 : x
2. Step 2: Convert to fraction form
   7,144.88/10,990.69 = 10,990.69/x
3. Step 3: Cross multiply
   7,144.88x = 10,990.69 × 10,990.69
4. Step 4: Simplify right side
   7,144.88x = 120,795,211.72
5. Step 5: Solve for x
   x = 120,795,211.72/7,144.88
6. Step 6: Final answer
   x = 16,906.55