Finding the Third Proportional to 143,640 and 308,900.25

Step by Step Solution

1. Step 1: Write the proportion equation
   143,640 : 308,900.25 = 308,900.25 : x
2. Step 2: Convert to fraction form
   143,640/308,900.25 = 308,900.25/x
3. Step 3: Cross multiply
   143,640x = 308,900.25 × 308,900.25
4. Step 4: Simplify right side
   143,640x = 95,419,364,450.06
5. Step 5: Solve for x
   x = 95,419,364,450.06/143,640
6. Step 6: Final answer
   x = 664,295.21