Finding the Third Proportional to 10,261.69 and 10,990.69

Step by Step Solution

1. Step 1: Write the proportion equation
   10,261.69 : 10,990.69 = 10,990.69 : x
2. Step 2: Convert to fraction form
   10,261.69/10,990.69 = 10,990.69/x
3. Step 3: Cross multiply
   10,261.69x = 10,990.69 × 10,990.69
4. Step 4: Simplify right side
   10,261.69x = 120,795,211.72
5. Step 5: Solve for x
   x = 120,795,211.72/10,261.69
6. Step 6: Final answer
   x = 11,771.48