Finding the Third Proportional to 142,528 and 309,344

Step by Step Solution

1. Step 1: Write the proportion equation
   142,528 : 309,344 = 309,344 : x
2. Step 2: Convert to fraction form
   142,528/309,344 = 309,344/x
3. Step 3: Cross multiply
   142,528x = 309,344 × 309,344
4. Step 4: Simplify right side
   142,528x = 95,693,710,336
5. Step 5: Solve for x
   x = 95,693,710,336/142,528
6. Step 6: Final answer
   x = 671,402.88