Finding the Third Proportional to 142,574 and 309,432

Step by Step Solution

1. Step 1: Write the proportion equation
   142,574 : 309,432 = 309,432 : x
2. Step 2: Convert to fraction form
   142,574/309,432 = 309,432/x
3. Step 3: Cross multiply
   142,574x = 309,432 × 309,432
4. Step 4: Simplify right side
   142,574x = 95,748,162,624
5. Step 5: Solve for x
   x = 95,748,162,624/142,574
6. Step 6: Final answer
   x = 671,568.19