Finding the Third Proportional to 3,990.94 and 8,766.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.94 : 8,766.56 = 8,766.56 : x
2. Step 2: Convert to fraction form
   3,990.94/8,766.56 = 8,766.56/x
3. Step 3: Cross multiply
   3,990.94x = 8,766.56 × 8,766.56
4. Step 4: Simplify right side
   3,990.94x = 76,852,618.07
5. Step 5: Solve for x
   x = 76,852,618.07/3,990.94
6. Step 6: Final answer
   x = 19,256.78