Finding the Third Proportional to 21,258 and 43,578

Step by Step Solution

1. Step 1: Write the proportion equation
   21,258 : 43,578 = 43,578 : x
2. Step 2: Convert to fraction form
   21,258/43,578 = 43,578/x
3. Step 3: Cross multiply
   21,258x = 43,578 × 43,578
4. Step 4: Simplify right side
   21,258x = 1,899,042,084
5. Step 5: Solve for x
   x = 1,899,042,084/21,258
6. Step 6: Final answer
   x = 89,333.06