Finding the Third Proportional to 216,108 and 317,155.50

Step by Step Solution

1. Step 1: Write the proportion equation
   216,108 : 317,155.50 = 317,155.50 : x
2. Step 2: Convert to fraction form
   216,108/317,155.50 = 317,155.50/x
3. Step 3: Cross multiply
   216,108x = 317,155.50 × 317,155.50
4. Step 4: Simplify right side
   216,108x = 100,587,611,180.25
5. Step 5: Solve for x
   x = 100,587,611,180.25/216,108
6. Step 6: Final answer
   x = 465,450.66