Finding the Third Proportional to 111,220 and 172,360

Step by Step Solution

1. Step 1: Write the proportion equation
   111,220 : 172,360 = 172,360 : x
2. Step 2: Convert to fraction form
   111,220/172,360 = 172,360/x
3. Step 3: Cross multiply
   111,220x = 172,360 × 172,360
4. Step 4: Simplify right side
   111,220x = 29,707,969,600
5. Step 5: Solve for x
   x = 29,707,969,600/111,220
6. Step 6: Final answer
   x = 267,109.96