Finding the Third Proportional to 6,978.66 and 10,991.95

Step by Step Solution

1. Step 1: Write the proportion equation
   6,978.66 : 10,991.95 = 10,991.95 : x
2. Step 2: Convert to fraction form
   6,978.66/10,991.95 = 10,991.95/x
3. Step 3: Cross multiply
   6,978.66x = 10,991.95 × 10,991.95
4. Step 4: Simplify right side
   6,978.66x = 120,823,033.50
5. Step 5: Solve for x
   x = 120,823,033.50/6,978.66
6. Step 6: Final answer
   x = 17,313.22