Finding the Third Proportional to 142,144.50 and 306,432

Step by Step Solution

1. Step 1: Write the proportion equation
   142,144.50 : 306,432 = 306,432 : x
2. Step 2: Convert to fraction form
   142,144.50/306,432 = 306,432/x
3. Step 3: Cross multiply
   142,144.50x = 306,432 × 306,432
4. Step 4: Simplify right side
   142,144.50x = 93,900,570,624
5. Step 5: Solve for x
   x = 93,900,570,624/142,144.50
6. Step 6: Final answer
   x = 660,599.39