Finding the Third Proportional to 19,692 and 31,890

Step by Step Solution

1. Step 1: Write the proportion equation
   19,692 : 31,890 = 31,890 : x
2. Step 2: Convert to fraction form
   19,692/31,890 = 31,890/x
3. Step 3: Cross multiply
   19,692x = 31,890 × 31,890
4. Step 4: Simplify right side
   19,692x = 1,016,972,100
5. Step 5: Solve for x
   x = 1,016,972,100/19,692
6. Step 6: Final answer
   x = 51,643.92