Finding the Third Proportional to 20,320 and 31,400

Step by Step Solution

1. Step 1: Write the proportion equation
   20,320 : 31,400 = 31,400 : x
2. Step 2: Convert to fraction form
   20,320/31,400 = 31,400/x
3. Step 3: Cross multiply
   20,320x = 31,400 × 31,400
4. Step 4: Simplify right side
   20,320x = 985,960,000
5. Step 5: Solve for x
   x = 985,960,000/20,320
6. Step 6: Final answer
   x = 48,521.65