Finding the Third Proportional to 128,878.50 and 197,145

Step by Step Solution

1. Step 1: Write the proportion equation
   128,878.50 : 197,145 = 197,145 : x
2. Step 2: Convert to fraction form
   128,878.50/197,145 = 197,145/x
3. Step 3: Cross multiply
   128,878.50x = 197,145 × 197,145
4. Step 4: Simplify right side
   128,878.50x = 38,866,151,025
5. Step 5: Solve for x
   x = 38,866,151,025/128,878.50
6. Step 6: Final answer
   x = 301,572.03