Finding the Third Proportional to 143,900.50 and 308,945

Step by Step Solution

1. Step 1: Write the proportion equation
   143,900.50 : 308,945 = 308,945 : x
2. Step 2: Convert to fraction form
   143,900.50/308,945 = 308,945/x
3. Step 3: Cross multiply
   143,900.50x = 308,945 × 308,945
4. Step 4: Simplify right side
   143,900.50x = 95,447,013,025
5. Step 5: Solve for x
   x = 95,447,013,025/143,900.50
6. Step 6: Final answer
   x = 663,284.79