Finding the Third Proportional to 3,945 and 7,066.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945 : 7,066.50 = 7,066.50 : x
2. Step 2: Convert to fraction form
   3,945/7,066.50 = 7,066.50/x
3. Step 3: Cross multiply
   3,945x = 7,066.50 × 7,066.50
4. Step 4: Simplify right side
   3,945x = 49,935,422.25
5. Step 5: Solve for x
   x = 49,935,422.25/3,945
6. Step 6: Final answer
   x = 12,657.90