Finding the Third Proportional to 20,920.78 and 31,426.73

Step by Step Solution

1. Step 1: Write the proportion equation
   20,920.78 : 31,426.73 = 31,426.73 : x
2. Step 2: Convert to fraction form
   20,920.78/31,426.73 = 31,426.73/x
3. Step 3: Cross multiply
   20,920.78x = 31,426.73 × 31,426.73
4. Step 4: Simplify right side
   20,920.78x = 987,639,633.48
5. Step 5: Solve for x
   x = 987,639,633.48/20,920.78
6. Step 6: Final answer
   x = 47,208.54