Finding the Third Proportional to 142,008 and 309,072

Step by Step Solution

1. Step 1: Write the proportion equation
   142,008 : 309,072 = 309,072 : x
2. Step 2: Convert to fraction form
   142,008/309,072 = 309,072/x
3. Step 3: Cross multiply
   142,008x = 309,072 × 309,072
4. Step 4: Simplify right side
   142,008x = 95,525,501,184
5. Step 5: Solve for x
   x = 95,525,501,184/142,008
6. Step 6: Final answer
   x = 672,676.90