Finding the Third Proportional to 191.50 and 356.50

Step by Step Solution

1. Step 1: Write the proportion equation
   191.50 : 356.50 = 356.50 : x
2. Step 2: Convert to fraction form
   191.50/356.50 = 356.50/x
3. Step 3: Cross multiply
   191.50x = 356.50 × 356.50
4. Step 4: Simplify right side
   191.50x = 127,092.25
5. Step 5: Solve for x
   x = 127,092.25/191.50
6. Step 6: Final answer
   x = 663.67