Finding the Third Proportional to 3,870.28 and 8,272.13

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.28 : 8,272.13 = 8,272.13 : x
2. Step 2: Convert to fraction form
   3,870.28/8,272.13 = 8,272.13/x
3. Step 3: Cross multiply
   3,870.28x = 8,272.13 × 8,272.13
4. Step 4: Simplify right side
   3,870.28x = 68,428,052.02
5. Step 5: Solve for x
   x = 68,428,052.02/3,870.28
6. Step 6: Final answer
   x = 17,680.38