Finding the Third Proportional to 142,572 and 309,428

Step by Step Solution

1. Step 1: Write the proportion equation
   142,572 : 309,428 = 309,428 : x
2. Step 2: Convert to fraction form
   142,572/309,428 = 309,428/x
3. Step 3: Cross multiply
   142,572x = 309,428 × 309,428
4. Step 4: Simplify right side
   142,572x = 95,745,687,184
5. Step 5: Solve for x
   x = 95,745,687,184/142,572
6. Step 6: Final answer
   x = 671,560.24