Finding the Third Proportional to 142,959 and 210,280

Step by Step Solution

1. Step 1: Write the proportion equation
   142,959 : 210,280 = 210,280 : x
2. Step 2: Convert to fraction form
   142,959/210,280 = 210,280/x
3. Step 3: Cross multiply
   142,959x = 210,280 × 210,280
4. Step 4: Simplify right side
   142,959x = 44,217,678,400
5. Step 5: Solve for x
   x = 44,217,678,400/142,959
6. Step 6: Final answer
   x = 309,303.22