Finding the Third Proportional to 21,355 and 31,480

Step by Step Solution

1. Step 1: Write the proportion equation
   21,355 : 31,480 = 31,480 : x
2. Step 2: Convert to fraction form
   21,355/31,480 = 31,480/x
3. Step 3: Cross multiply
   21,355x = 31,480 × 31,480
4. Step 4: Simplify right side
   21,355x = 990,990,400
5. Step 5: Solve for x
   x = 990,990,400/21,355
6. Step 6: Final answer
   x = 46,405.54