Finding the Third Proportional to 21,672 and 30,438

Step by Step Solution

1. Step 1: Write the proportion equation
   21,672 : 30,438 = 30,438 : x
2. Step 2: Convert to fraction form
   21,672/30,438 = 30,438/x
3. Step 3: Cross multiply
   21,672x = 30,438 × 30,438
4. Step 4: Simplify right side
   21,672x = 926,471,844
5. Step 5: Solve for x
   x = 926,471,844/21,672
6. Step 6: Final answer
   x = 42,749.72