Finding the Third Proportional to 4,279.50 and 8,989.31

Step by Step Solution

1. Step 1: Write the proportion equation
   4,279.50 : 8,989.31 = 8,989.31 : x
2. Step 2: Convert to fraction form
   4,279.50/8,989.31 = 8,989.31/x
3. Step 3: Cross multiply
   4,279.50x = 8,989.31 × 8,989.31
4. Step 4: Simplify right side
   4,279.50x = 80,807,739.22
5. Step 5: Solve for x
   x = 80,807,739.22/4,279.50
6. Step 6: Final answer
   x = 18,882.52