Finding the Third Proportional to 128,142 and 197,228.25

Step by Step Solution

1. Step 1: Write the proportion equation
   128,142 : 197,228.25 = 197,228.25 : x
2. Step 2: Convert to fraction form
   128,142/197,228.25 = 197,228.25/x
3. Step 3: Cross multiply
   128,142x = 197,228.25 × 197,228.25
4. Step 4: Simplify right side
   128,142x = 38,898,982,598.06
5. Step 5: Solve for x
   x = 38,898,982,598.06/128,142
6. Step 6: Final answer
   x = 303,561.54