Finding the Third Proportional to 3,900.66 and 8,506.27

Step by Step Solution

1. Step 1: Write the proportion equation
   3,900.66 : 8,506.27 = 8,506.27 : x
2. Step 2: Convert to fraction form
   3,900.66/8,506.27 = 8,506.27/x
3. Step 3: Cross multiply
   3,900.66x = 8,506.27 × 8,506.27
4. Step 4: Simplify right side
   3,900.66x = 72,356,554.88
5. Step 5: Solve for x
   x = 72,356,554.88/3,900.66
6. Step 6: Final answer
   x = 18,549.84