Finding the Third Proportional to 21,170 and 30,123

Step by Step Solution

1. Step 1: Write the proportion equation
   21,170 : 30,123 = 30,123 : x
2. Step 2: Convert to fraction form
   21,170/30,123 = 30,123/x
3. Step 3: Cross multiply
   21,170x = 30,123 × 30,123
4. Step 4: Simplify right side
   21,170x = 907,395,129
5. Step 5: Solve for x
   x = 907,395,129/21,170
6. Step 6: Final answer
   x = 42,862.31