Finding the Third Proportional to 143,446.50 and 315,202

Step by Step Solution

1. Step 1: Write the proportion equation
   143,446.50 : 315,202 = 315,202 : x
2. Step 2: Convert to fraction form
   143,446.50/315,202 = 315,202/x
3. Step 3: Cross multiply
   143,446.50x = 315,202 × 315,202
4. Step 4: Simplify right side
   143,446.50x = 99,352,300,804
5. Step 5: Solve for x
   x = 99,352,300,804/143,446.50
6. Step 6: Final answer
   x = 692,608.75