Finding the Third Proportional to 126,990 and 200,910

Step by Step Solution

1. Step 1: Write the proportion equation
   126,990 : 200,910 = 200,910 : x
2. Step 2: Convert to fraction form
   126,990/200,910 = 200,910/x
3. Step 3: Cross multiply
   126,990x = 200,910 × 200,910
4. Step 4: Simplify right side
   126,990x = 40,364,828,100
5. Step 5: Solve for x
   x = 40,364,828,100/126,990
6. Step 6: Final answer
   x = 317,858.32