Finding the Third Proportional to 20,786.50 and 39,659.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,786.50 : 39,659.50 = 39,659.50 : x
2. Step 2: Convert to fraction form
   20,786.50/39,659.50 = 39,659.50/x
3. Step 3: Cross multiply
   20,786.50x = 39,659.50 × 39,659.50
4. Step 4: Simplify right side
   20,786.50x = 1,572,875,940.25
5. Step 5: Solve for x
   x = 1,572,875,940.25/20,786.50
6. Step 6: Final answer
   x = 75,668.15