Finding the Third Proportional to 191,170 and 398,016

Step by Step Solution

1. Step 1: Write the proportion equation
   191,170 : 398,016 = 398,016 : x
2. Step 2: Convert to fraction form
   191,170/398,016 = 398,016/x
3. Step 3: Cross multiply
   191,170x = 398,016 × 398,016
4. Step 4: Simplify right side
   191,170x = 158,416,736,256
5. Step 5: Solve for x
   x = 158,416,736,256/191,170
6. Step 6: Final answer
   x = 828,669.44