Finding the Third Proportional to 6,690.09 and 10,957.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,690.09 : 10,957.78 = 10,957.78 : x
2. Step 2: Convert to fraction form
   6,690.09/10,957.78 = 10,957.78/x
3. Step 3: Cross multiply
   6,690.09x = 10,957.78 × 10,957.78
4. Step 4: Simplify right side
   6,690.09x = 120,072,969.92
5. Step 5: Solve for x
   x = 120,072,969.92/6,690.09
6. Step 6: Final answer
   x = 17,947.88