Finding the Third Proportional to 21,489 and 30,261

Step by Step Solution

1. Step 1: Write the proportion equation
   21,489 : 30,261 = 30,261 : x
2. Step 2: Convert to fraction form
   21,489/30,261 = 30,261/x
3. Step 3: Cross multiply
   21,489x = 30,261 × 30,261
4. Step 4: Simplify right side
   21,489x = 915,728,121
5. Step 5: Solve for x
   x = 915,728,121/21,489
6. Step 6: Final answer
   x = 42,613.81