Finding the Third Proportional to 143,448 and 315,205.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,448 : 315,205.50 = 315,205.50 : x
2. Step 2: Convert to fraction form
   143,448/315,205.50 = 315,205.50/x
3. Step 3: Cross multiply
   143,448x = 315,205.50 × 315,205.50
4. Step 4: Simplify right side
   143,448x = 99,354,507,230.25
5. Step 5: Solve for x
   x = 99,354,507,230.25/143,448
6. Step 6: Final answer
   x = 692,616.89