Finding the Third Proportional to 216,609 and 323,116.50

Step by Step Solution

1. Step 1: Write the proportion equation
   216,609 : 323,116.50 = 323,116.50 : x
2. Step 2: Convert to fraction form
   216,609/323,116.50 = 323,116.50/x
3. Step 3: Cross multiply
   216,609x = 323,116.50 × 323,116.50
4. Step 4: Simplify right side
   216,609x = 104,404,272,572.25
5. Step 5: Solve for x
   x = 104,404,272,572.25/216,609
6. Step 6: Final answer
   x = 481,994.16