Finding the Third Proportional to 191,689.50 and 395,671.50

Step by Step Solution

1. Step 1: Write the proportion equation
   191,689.50 : 395,671.50 = 395,671.50 : x
2. Step 2: Convert to fraction form
   191,689.50/395,671.50 = 395,671.50/x
3. Step 3: Cross multiply
   191,689.50x = 395,671.50 × 395,671.50
4. Step 4: Simplify right side
   191,689.50x = 156,555,935,912.25
5. Step 5: Solve for x
   x = 156,555,935,912.25/191,689.50
6. Step 6: Final answer
   x = 816,716.28