Finding the Third Proportional to 8,581.78 and 18,590.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,581.78 : 18,590.86 = 18,590.86 : x
2. Step 2: Convert to fraction form
   8,581.78/18,590.86 = 18,590.86/x
3. Step 3: Cross multiply
   8,581.78x = 18,590.86 × 18,590.86
4. Step 4: Simplify right side
   8,581.78x = 345,620,052.30
5. Step 5: Solve for x
   x = 345,620,052.30/8,581.78
6. Step 6: Final answer
   x = 40,273.70