Finding the Third Proportional to 144,042 and 309,406.50

Step by Step Solution

1. Step 1: Write the proportion equation
   144,042 : 309,406.50 = 309,406.50 : x
2. Step 2: Convert to fraction form
   144,042/309,406.50 = 309,406.50/x
3. Step 3: Cross multiply
   144,042x = 309,406.50 × 309,406.50
4. Step 4: Simplify right side
   144,042x = 95,732,382,242.25
5. Step 5: Solve for x
   x = 95,732,382,242.25/144,042
6. Step 6: Final answer
   x = 664,614.36