Finding the Third Proportional to 142,248 and 311,280

Step by Step Solution

1. Step 1: Write the proportion equation
   142,248 : 311,280 = 311,280 : x
2. Step 2: Convert to fraction form
   142,248/311,280 = 311,280/x
3. Step 3: Cross multiply
   142,248x = 311,280 × 311,280
4. Step 4: Simplify right side
   142,248x = 96,895,238,400
5. Step 5: Solve for x
   x = 96,895,238,400/142,248
6. Step 6: Final answer
   x = 681,171.18