Finding the Third Proportional to 21,609 and 43,818

Step by Step Solution

1. Step 1: Write the proportion equation
   21,609 : 43,818 = 43,818 : x
2. Step 2: Convert to fraction form
   21,609/43,818 = 43,818/x
3. Step 3: Cross multiply
   21,609x = 43,818 × 43,818
4. Step 4: Simplify right side
   21,609x = 1,920,017,124
5. Step 5: Solve for x
   x = 1,920,017,124/21,609
6. Step 6: Final answer
   x = 88,852.66