Finding the Third Proportional to 262,605.50 and 405,554

Step by Step Solution

1. Step 1: Write the proportion equation
   262,605.50 : 405,554 = 405,554 : x
2. Step 2: Convert to fraction form
   262,605.50/405,554 = 405,554/x
3. Step 3: Cross multiply
   262,605.50x = 405,554 × 405,554
4. Step 4: Simplify right side
   262,605.50x = 164,474,046,916
5. Step 5: Solve for x
   x = 164,474,046,916/262,605.50
6. Step 6: Final answer
   x = 626,316.08