Finding the Third Proportional to 3,922.50 and 8,559.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,922.50 : 8,559.50 = 8,559.50 : x
2. Step 2: Convert to fraction form
   3,922.50/8,559.50 = 8,559.50/x
3. Step 3: Cross multiply
   3,922.50x = 8,559.50 × 8,559.50
4. Step 4: Simplify right side
   3,922.50x = 73,265,040.25
5. Step 5: Solve for x
   x = 73,265,040.25/3,922.50
6. Step 6: Final answer
   x = 18,678.15