Finding the Third Proportional to 20,400 and 30,660

Step by Step Solution

1. Step 1: Write the proportion equation
   20,400 : 30,660 = 30,660 : x
2. Step 2: Convert to fraction form
   20,400/30,660 = 30,660/x
3. Step 3: Cross multiply
   20,400x = 30,660 × 30,660
4. Step 4: Simplify right side
   20,400x = 940,035,600
5. Step 5: Solve for x
   x = 940,035,600/20,400
6. Step 6: Final answer
   x = 46,080.18