Finding the Third Proportional to 143,922 and 314,988

Step by Step Solution

1. Step 1: Write the proportion equation
   143,922 : 314,988 = 314,988 : x
2. Step 2: Convert to fraction form
   143,922/314,988 = 314,988/x
3. Step 3: Cross multiply
   143,922x = 314,988 × 314,988
4. Step 4: Simplify right side
   143,922x = 99,217,440,144
5. Step 5: Solve for x
   x = 99,217,440,144/143,922
6. Step 6: Final answer
   x = 689,383.42