Finding the Third Proportional to 51,390 and 111,609

Step by Step Solution

1. Step 1: Write the proportion equation
   51,390 : 111,609 = 111,609 : x
2. Step 2: Convert to fraction form
   51,390/111,609 = 111,609/x
3. Step 3: Cross multiply
   51,390x = 111,609 × 111,609
4. Step 4: Simplify right side
   51,390x = 12,456,568,881
5. Step 5: Solve for x
   x = 12,456,568,881/51,390
6. Step 6: Final answer
   x = 242,392.86