Finding the Third Proportional to 191,464.50 and 398,685

Step by Step Solution

1. Step 1: Write the proportion equation
   191,464.50 : 398,685 = 398,685 : x
2. Step 2: Convert to fraction form
   191,464.50/398,685 = 398,685/x
3. Step 3: Cross multiply
   191,464.50x = 398,685 × 398,685
4. Step 4: Simplify right side
   191,464.50x = 158,949,729,225
5. Step 5: Solve for x
   x = 158,949,729,225/191,464.50
6. Step 6: Final answer
   x = 830,178.59