Finding the Third Proportional to 21,008 and 31,512

Step by Step Solution

1. Step 1: Write the proportion equation
   21,008 : 31,512 = 31,512 : x
2. Step 2: Convert to fraction form
   21,008/31,512 = 31,512/x
3. Step 3: Cross multiply
   21,008x = 31,512 × 31,512
4. Step 4: Simplify right side
   21,008x = 993,006,144
5. Step 5: Solve for x
   x = 993,006,144/21,008
6. Step 6: Final answer
   x = 47,268