Finding the Third Proportional to 3,943.69 and 8,485.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,943.69 : 8,485.31 = 8,485.31 : x
2. Step 2: Convert to fraction form
   3,943.69/8,485.31 = 8,485.31/x
3. Step 3: Cross multiply
   3,943.69x = 8,485.31 × 8,485.31
4. Step 4: Simplify right side
   3,943.69x = 72,000,528.22
5. Step 5: Solve for x
   x = 72,000,528.22/3,943.69
6. Step 6: Final answer
   x = 18,257.16