Finding the Third Proportional to 192,488.50 and 397,172

Step by Step Solution

1. Step 1: Write the proportion equation
   192,488.50 : 397,172 = 397,172 : x
2. Step 2: Convert to fraction form
   192,488.50/397,172 = 397,172/x
3. Step 3: Cross multiply
   192,488.50x = 397,172 × 397,172
4. Step 4: Simplify right side
   192,488.50x = 157,745,597,584
5. Step 5: Solve for x
   x = 157,745,597,584/192,488.50
6. Step 6: Final answer
   x = 819,506.61