Finding the Third Proportional to 268,242.50 and 405,099.50

Step by Step Solution

1. Step 1: Write the proportion equation
   268,242.50 : 405,099.50 = 405,099.50 : x
2. Step 2: Convert to fraction form
   268,242.50/405,099.50 = 405,099.50/x
3. Step 3: Cross multiply
   268,242.50x = 405,099.50 × 405,099.50
4. Step 4: Simplify right side
   268,242.50x = 164,105,604,900.25
5. Step 5: Solve for x
   x = 164,105,604,900.25/268,242.50
6. Step 6: Final answer
   x = 611,780.78