Finding the Third Proportional to 355,144.50 and 543,287.25

Step by Step Solution

1. Step 1: Write the proportion equation
   355,144.50 : 543,287.25 = 543,287.25 : x
2. Step 2: Convert to fraction form
   355,144.50/543,287.25 = 543,287.25/x
3. Step 3: Cross multiply
   355,144.50x = 543,287.25 × 543,287.25
4. Step 4: Simplify right side
   355,144.50x = 295,161,036,012.56
5. Step 5: Solve for x
   x = 295,161,036,012.56/355,144.50
6. Step 6: Final answer
   x = 831,101.24