Finding the Third Proportional to 3,947.91 and 8,556.47

Step by Step Solution

1. Step 1: Write the proportion equation
   3,947.91 : 8,556.47 = 8,556.47 : x
2. Step 2: Convert to fraction form
   3,947.91/8,556.47 = 8,556.47/x
3. Step 3: Cross multiply
   3,947.91x = 8,556.47 × 8,556.47
4. Step 4: Simplify right side
   3,947.91x = 73,213,157.47
5. Step 5: Solve for x
   x = 73,213,157.47/3,947.91
6. Step 6: Final answer
   x = 18,544.81