Finding the Third Proportional to 20,748 and 31,890

Step by Step Solution

1. Step 1: Write the proportion equation
   20,748 : 31,890 = 31,890 : x
2. Step 2: Convert to fraction form
   20,748/31,890 = 31,890/x
3. Step 3: Cross multiply
   20,748x = 31,890 × 31,890
4. Step 4: Simplify right side
   20,748x = 1,016,972,100
5. Step 5: Solve for x
   x = 1,016,972,100/20,748
6. Step 6: Final answer
   x = 49,015.43