Finding the Third Proportional to 21,178 and 31,151

Step by Step Solution

1. Step 1: Write the proportion equation
   21,178 : 31,151 = 31,151 : x
2. Step 2: Convert to fraction form
   21,178/31,151 = 31,151/x
3. Step 3: Cross multiply
   21,178x = 31,151 × 31,151
4. Step 4: Simplify right side
   21,178x = 970,384,801
5. Step 5: Solve for x
   x = 970,384,801/21,178
6. Step 6: Final answer
   x = 45,820.42