Finding the Third Proportional to 20,516 and 30,390

Step by Step Solution

1. Step 1: Write the proportion equation
   20,516 : 30,390 = 30,390 : x
2. Step 2: Convert to fraction form
   20,516/30,390 = 30,390/x
3. Step 3: Cross multiply
   20,516x = 30,390 × 30,390
4. Step 4: Simplify right side
   20,516x = 923,552,100
5. Step 5: Solve for x
   x = 923,552,100/20,516
6. Step 6: Final answer
   x = 45,016.19