Finding the Third Proportional to 21,123 and 31,009

Step by Step Solution

1. Step 1: Write the proportion equation
   21,123 : 31,009 = 31,009 : x
2. Step 2: Convert to fraction form
   21,123/31,009 = 31,009/x
3. Step 3: Cross multiply
   21,123x = 31,009 × 31,009
4. Step 4: Simplify right side
   21,123x = 961,558,081
5. Step 5: Solve for x
   x = 961,558,081/21,123
6. Step 6: Final answer
   x = 45,521.85