Finding the Third Proportional to 155,499 and 220,216.50

Step by Step Solution

1. Step 1: Write the proportion equation
   155,499 : 220,216.50 = 220,216.50 : x
2. Step 2: Convert to fraction form
   155,499/220,216.50 = 220,216.50/x
3. Step 3: Cross multiply
   155,499x = 220,216.50 × 220,216.50
4. Step 4: Simplify right side
   155,499x = 48,495,306,872.25
5. Step 5: Solve for x
   x = 48,495,306,872.25/155,499
6. Step 6: Final answer
   x = 311,868.93