Finding the Third Proportional to 128,938.50 and 197,112

Step by Step Solution

1. Step 1: Write the proportion equation
   128,938.50 : 197,112 = 197,112 : x
2. Step 2: Convert to fraction form
   128,938.50/197,112 = 197,112/x
3. Step 3: Cross multiply
   128,938.50x = 197,112 × 197,112
4. Step 4: Simplify right side
   128,938.50x = 38,853,140,544
5. Step 5: Solve for x
   x = 38,853,140,544/128,938.50
6. Step 6: Final answer
   x = 301,330.79