Finding the Third Proportional to 191,462 and 398,679

Step by Step Solution

1. Step 1: Write the proportion equation
   191,462 : 398,679 = 398,679 : x
2. Step 2: Convert to fraction form
   191,462/398,679 = 398,679/x
3. Step 3: Cross multiply
   191,462x = 398,679 × 398,679
4. Step 4: Simplify right side
   191,462x = 158,944,945,041
5. Step 5: Solve for x
   x = 158,944,945,041/191,462
6. Step 6: Final answer
   x = 830,164.45