Finding the Third Proportional to 191,938.50 and 396,171

Step by Step Solution

1. Step 1: Write the proportion equation
   191,938.50 : 396,171 = 396,171 : x
2. Step 2: Convert to fraction form
   191,938.50/396,171 = 396,171/x
3. Step 3: Cross multiply
   191,938.50x = 396,171 × 396,171
4. Step 4: Simplify right side
   191,938.50x = 156,951,461,241
5. Step 5: Solve for x
   x = 156,951,461,241/191,938.50
6. Step 6: Final answer
   x = 817,717.45