Finding the Third Proportional to 218,155.50 and 320,049

Step by Step Solution

1. Step 1: Write the proportion equation
   218,155.50 : 320,049 = 320,049 : x
2. Step 2: Convert to fraction form
   218,155.50/320,049 = 320,049/x
3. Step 3: Cross multiply
   218,155.50x = 320,049 × 320,049
4. Step 4: Simplify right side
   218,155.50x = 102,431,362,401
5. Step 5: Solve for x
   x = 102,431,362,401/218,155.50
6. Step 6: Final answer
   x = 469,533.72