Finding the Third Proportional to 21,687.75 and 41,917.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,687.75 : 41,917.50 = 41,917.50 : x
2. Step 2: Convert to fraction form
   21,687.75/41,917.50 = 41,917.50/x
3. Step 3: Cross multiply
   21,687.75x = 41,917.50 × 41,917.50
4. Step 4: Simplify right side
   21,687.75x = 1,757,076,806.25
5. Step 5: Solve for x
   x = 1,757,076,806.25/21,687.75
6. Step 6: Final answer
   x = 81,017.02