Finding the Third Proportional to 209,067 and 318,516.50

Step by Step Solution

1. Step 1: Write the proportion equation
   209,067 : 318,516.50 = 318,516.50 : x
2. Step 2: Convert to fraction form
   209,067/318,516.50 = 318,516.50/x
3. Step 3: Cross multiply
   209,067x = 318,516.50 × 318,516.50
4. Step 4: Simplify right side
   209,067x = 101,452,760,772.25
5. Step 5: Solve for x
   x = 101,452,760,772.25/209,067
6. Step 6: Final answer
   x = 485,264.34