Finding the Third Proportional to 20,911.50 and 31,380.75

Step by Step Solution

1. Step 1: Write the proportion equation
   20,911.50 : 31,380.75 = 31,380.75 : x
2. Step 2: Convert to fraction form
   20,911.50/31,380.75 = 31,380.75/x
3. Step 3: Cross multiply
   20,911.50x = 31,380.75 × 31,380.75
4. Step 4: Simplify right side
   20,911.50x = 984,751,470.56
5. Step 5: Solve for x
   x = 984,751,470.56/20,911.50
6. Step 6: Final answer
   x = 47,091.38