Finding the Third Proportional to 143,424 and 311,040

Step by Step Solution

1. Step 1: Write the proportion equation
   143,424 : 311,040 = 311,040 : x
2. Step 2: Convert to fraction form
   143,424/311,040 = 311,040/x
3. Step 3: Cross multiply
   143,424x = 311,040 × 311,040
4. Step 4: Simplify right side
   143,424x = 96,745,881,600
5. Step 5: Solve for x
   x = 96,745,881,600/143,424
6. Step 6: Final answer
   x = 674,544.58