Finding the Third Proportional to 39,728.25 and 82,690.88

Step by Step Solution

1. Step 1: Write the proportion equation
   39,728.25 : 82,690.88 = 82,690.88 : x
2. Step 2: Convert to fraction form
   39,728.25/82,690.88 = 82,690.88/x
3. Step 3: Cross multiply
   39,728.25x = 82,690.88 × 82,690.88
4. Step 4: Simplify right side
   39,728.25x = 6,837,780,808.27
5. Step 5: Solve for x
   x = 6,837,780,808.27/39,728.25
6. Step 6: Final answer
   x = 172,113.82