Finding the Third Proportional to 143,040 and 213,600

Step by Step Solution

1. Step 1: Write the proportion equation
   143,040 : 213,600 = 213,600 : x
2. Step 2: Convert to fraction form
   143,040/213,600 = 213,600/x
3. Step 3: Cross multiply
   143,040x = 213,600 × 213,600
4. Step 4: Simplify right side
   143,040x = 45,624,960,000
5. Step 5: Solve for x
   x = 45,624,960,000/143,040
6. Step 6: Final answer
   x = 318,966.44