Finding the Third Proportional to 311,040 and 666,144

Step by Step Solution

1. Step 1: Write the proportion equation
   311,040 : 666,144 = 666,144 : x
2. Step 2: Convert to fraction form
   311,040/666,144 = 666,144/x
3. Step 3: Cross multiply
   311,040x = 666,144 × 666,144
4. Step 4: Simplify right side
   311,040x = 443,747,828,736
5. Step 5: Solve for x
   x = 443,747,828,736/311,040
6. Step 6: Final answer
   x = 1,426,658.40