Finding the Third Proportional to 3,855.94 and 8,387.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,855.94 : 8,387.72 = 8,387.72 : x
2. Step 2: Convert to fraction form
   3,855.94/8,387.72 = 8,387.72/x
3. Step 3: Cross multiply
   3,855.94x = 8,387.72 × 8,387.72
4. Step 4: Simplify right side
   3,855.94x = 70,353,825.83
5. Step 5: Solve for x
   x = 70,353,825.83/3,855.94
6. Step 6: Final answer
   x = 18,245.58