Finding the Third Proportional to 199,639.69 and 309,301.03

Step by Step Solution

1. Step 1: Write the proportion equation
   199,639.69 : 309,301.03 = 309,301.03 : x
2. Step 2: Convert to fraction form
   199,639.69/309,301.03 = 309,301.03/x
3. Step 3: Cross multiply
   199,639.69x = 309,301.03 × 309,301.03
4. Step 4: Simplify right side
   199,639.69x = 95,667,127,932.31
5. Step 5: Solve for x
   x = 95,667,127,932.31/199,639.69
6. Step 6: Final answer
   x = 479,198.95