Finding the Third Proportional to 7,040 and 10,990

Step by Step Solution

1. Step 1: Write the proportion equation
   7,040 : 10,990 = 10,990 : x
2. Step 2: Convert to fraction form
   7,040/10,990 = 10,990/x
3. Step 3: Cross multiply
   7,040x = 10,990 × 10,990
4. Step 4: Simplify right side
   7,040x = 120,780,100
5. Step 5: Solve for x
   x = 120,780,100/7,040
6. Step 6: Final answer
   x = 17,156.26