Finding the Third Proportional to 8,636.89 and 18,311.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,636.89 : 18,311.72 = 18,311.72 : x
2. Step 2: Convert to fraction form
   8,636.89/18,311.72 = 18,311.72/x
3. Step 3: Cross multiply
   8,636.89x = 18,311.72 × 18,311.72
4. Step 4: Simplify right side
   8,636.89x = 335,319,043.58
5. Step 5: Solve for x
   x = 335,319,043.58/8,636.89
6. Step 6: Final answer
   x = 38,824.05