Finding the Third Proportional to 111,290 and 170,621

Step by Step Solution

1. Step 1: Write the proportion equation
   111,290 : 170,621 = 170,621 : x
2. Step 2: Convert to fraction form
   111,290/170,621 = 170,621/x
3. Step 3: Cross multiply
   111,290x = 170,621 × 170,621
4. Step 4: Simplify right side
   111,290x = 29,111,525,641
5. Step 5: Solve for x
   x = 29,111,525,641/111,290
6. Step 6: Final answer
   x = 261,582.58