Finding the Third Proportional to 111,990 and 173,421

Step by Step Solution

1. Step 1: Write the proportion equation
   111,990 : 173,421 = 173,421 : x
2. Step 2: Convert to fraction form
   111,990/173,421 = 173,421/x
3. Step 3: Cross multiply
   111,990x = 173,421 × 173,421
4. Step 4: Simplify right side
   111,990x = 30,074,843,241
5. Step 5: Solve for x
   x = 30,074,843,241/111,990
6. Step 6: Final answer
   x = 268,549.36