Finding the Third Proportional to 3,972.80 and 8,386.03

Step by Step Solution

1. Step 1: Write the proportion equation
   3,972.80 : 8,386.03 = 8,386.03 : x
2. Step 2: Convert to fraction form
   3,972.80/8,386.03 = 8,386.03/x
3. Step 3: Cross multiply
   3,972.80x = 8,386.03 × 8,386.03
4. Step 4: Simplify right side
   3,972.80x = 70,325,520.13
5. Step 5: Solve for x
   x = 70,325,520.13/3,972.80
6. Step 6: Final answer
   x = 17,701.77