Finding the Third Proportional to 143,430 and 311,736

Step by Step Solution

1. Step 1: Write the proportion equation
   143,430 : 311,736 = 311,736 : x
2. Step 2: Convert to fraction form
   143,430/311,736 = 311,736/x
3. Step 3: Cross multiply
   143,430x = 311,736 × 311,736
4. Step 4: Simplify right side
   143,430x = 97,179,333,696
5. Step 5: Solve for x
   x = 97,179,333,696/143,430
6. Step 6: Final answer
   x = 677,538.41