Finding the Third Proportional to 20,215 and 30,900

Step by Step Solution

1. Step 1: Write the proportion equation
   20,215 : 30,900 = 30,900 : x
2. Step 2: Convert to fraction form
   20,215/30,900 = 30,900/x
3. Step 3: Cross multiply
   20,215x = 30,900 × 30,900
4. Step 4: Simplify right side
   20,215x = 954,810,000
5. Step 5: Solve for x
   x = 954,810,000/20,215
6. Step 6: Final answer
   x = 47,232.75