Finding the Third Proportional to 128,697 and 196,870.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,697 : 196,870.50 = 196,870.50 : x
2. Step 2: Convert to fraction form
   128,697/196,870.50 = 196,870.50/x
3. Step 3: Cross multiply
   128,697x = 196,870.50 × 196,870.50
4. Step 4: Simplify right side
   128,697x = 38,757,993,770.25
5. Step 5: Solve for x
   x = 38,757,993,770.25/128,697
6. Step 6: Final answer
   x = 301,156.93