Finding the Third Proportional to 128,216.25 and 199,047.38

Step by Step Solution

1. Step 1: Write the proportion equation
   128,216.25 : 199,047.38 = 199,047.38 : x
2. Step 2: Convert to fraction form
   128,216.25/199,047.38 = 199,047.38/x
3. Step 3: Cross multiply
   128,216.25x = 199,047.38 × 199,047.38
4. Step 4: Simplify right side
   128,216.25x = 39,619,857,494.39
5. Step 5: Solve for x
   x = 39,619,857,494.39/128,216.25
6. Step 6: Final answer
   x = 309,008.08