Finding the Third Proportional to 20,389.50 and 41,791.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,389.50 : 41,791.50 = 41,791.50 : x
2. Step 2: Convert to fraction form
   20,389.50/41,791.50 = 41,791.50/x
3. Step 3: Cross multiply
   20,389.50x = 41,791.50 × 41,791.50
4. Step 4: Simplify right side
   20,389.50x = 1,746,529,472.25
5. Step 5: Solve for x
   x = 1,746,529,472.25/20,389.50
6. Step 6: Final answer
   x = 85,658.28