Finding the Third Proportional to 142,031 and 309,486

Step by Step Solution

1. Step 1: Write the proportion equation
   142,031 : 309,486 = 309,486 : x
2. Step 2: Convert to fraction form
   142,031/309,486 = 309,486/x
3. Step 3: Cross multiply
   142,031x = 309,486 × 309,486
4. Step 4: Simplify right side
   142,031x = 95,781,584,196
5. Step 5: Solve for x
   x = 95,781,584,196/142,031
6. Step 6: Final answer
   x = 674,370.98