Finding the Third Proportional to 56,728.50 and 123,405

Step by Step Solution

1. Step 1: Write the proportion equation
   56,728.50 : 123,405 = 123,405 : x
2. Step 2: Convert to fraction form
   56,728.50/123,405 = 123,405/x
3. Step 3: Cross multiply
   56,728.50x = 123,405 × 123,405
4. Step 4: Simplify right side
   56,728.50x = 15,228,794,025
5. Step 5: Solve for x
   x = 15,228,794,025/56,728.50
6. Step 6: Final answer
   x = 268,450.50