Finding the Third Proportional to 141,642 and 309,042

Step by Step Solution

1. Step 1: Write the proportion equation
   141,642 : 309,042 = 309,042 : x
2. Step 2: Convert to fraction form
   141,642/309,042 = 309,042/x
3. Step 3: Cross multiply
   141,642x = 309,042 × 309,042
4. Step 4: Simplify right side
   141,642x = 95,506,957,764
5. Step 5: Solve for x
   x = 95,506,957,764/141,642
6. Step 6: Final answer
   x = 674,284.17