Finding the Third Proportional to 21,016.50 and 31,439.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,016.50 : 31,439.50 = 31,439.50 : x
2. Step 2: Convert to fraction form
   21,016.50/31,439.50 = 31,439.50/x
3. Step 3: Cross multiply
   21,016.50x = 31,439.50 × 31,439.50
4. Step 4: Simplify right side
   21,016.50x = 988,442,160.25
5. Step 5: Solve for x
   x = 988,442,160.25/21,016.50
6. Step 6: Final answer
   x = 47,031.72