Finding the Third Proportional to 20,971.41 and 40,879.69

Step by Step Solution

1. Step 1: Write the proportion equation
   20,971.41 : 40,879.69 = 40,879.69 : x
2. Step 2: Convert to fraction form
   20,971.41/40,879.69 = 40,879.69/x
3. Step 3: Cross multiply
   20,971.41x = 40,879.69 × 40,879.69
4. Step 4: Simplify right side
   20,971.41x = 1,671,148,850.10
5. Step 5: Solve for x
   x = 1,671,148,850.10/20,971.41
6. Step 6: Final answer
   x = 79,687.02