Finding the Third Proportional to 143,318 and 298,399.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,318 : 298,399.50 = 298,399.50 : x
2. Step 2: Convert to fraction form
   143,318/298,399.50 = 298,399.50/x
3. Step 3: Cross multiply
   143,318x = 298,399.50 × 298,399.50
4. Step 4: Simplify right side
   143,318x = 89,042,261,600.25
5. Step 5: Solve for x
   x = 89,042,261,600.25/143,318
6. Step 6: Final answer
   x = 621,291.54