Finding the Third Proportional to 143,144 and 314,608

Step by Step Solution

1. Step 1: Write the proportion equation
   143,144 : 314,608 = 314,608 : x
2. Step 2: Convert to fraction form
   143,144/314,608 = 314,608/x
3. Step 3: Cross multiply
   143,144x = 314,608 × 314,608
4. Step 4: Simplify right side
   143,144x = 98,978,193,664
5. Step 5: Solve for x
   x = 98,978,193,664/143,144
6. Step 6: Final answer
   x = 691,458.91