Finding the Third Proportional to 21,123 and 45,731

Step by Step Solution

1. Step 1: Write the proportion equation
   21,123 : 45,731 = 45,731 : x
2. Step 2: Convert to fraction form
   21,123/45,731 = 45,731/x
3. Step 3: Cross multiply
   21,123x = 45,731 × 45,731
4. Step 4: Simplify right side
   21,123x = 2,091,324,361
5. Step 5: Solve for x
   x = 2,091,324,361/21,123
6. Step 6: Final answer
   x = 99,006.98