Finding the Third Proportional to 111,987 and 173,403

Step by Step Solution

1. Step 1: Write the proportion equation
   111,987 : 173,403 = 173,403 : x
2. Step 2: Convert to fraction form
   111,987/173,403 = 173,403/x
3. Step 3: Cross multiply
   111,987x = 173,403 × 173,403
4. Step 4: Simplify right side
   111,987x = 30,068,600,409
5. Step 5: Solve for x
   x = 30,068,600,409/111,987
6. Step 6: Final answer
   x = 268,500.81