Finding the Third Proportional to 357,198 and 485,113.50

Step by Step Solution

1. Step 1: Write the proportion equation
   357,198 : 485,113.50 = 485,113.50 : x
2. Step 2: Convert to fraction form
   357,198/485,113.50 = 485,113.50/x
3. Step 3: Cross multiply
   357,198x = 485,113.50 × 485,113.50
4. Step 4: Simplify right side
   357,198x = 235,335,107,882.25
5. Step 5: Solve for x
   x = 235,335,107,882.25/357,198
6. Step 6: Final answer
   x = 658,836.58