Finding the Third Proportional to 196.17 and 399.94

Step by Step Solution

1. Step 1: Write the proportion equation
   196.17 : 399.94 = 399.94 : x
2. Step 2: Convert to fraction form
   196.17/399.94 = 399.94/x
3. Step 3: Cross multiply
   196.17x = 399.94 × 399.94
4. Step 4: Simplify right side
   196.17x = 159,950.00
5. Step 5: Solve for x
   x = 159,950.00/196.17
6. Step 6: Final answer
   x = 815.36