Finding the Third Proportional to 142,878 and 210,049

Step by Step Solution

1. Step 1: Write the proportion equation
   142,878 : 210,049 = 210,049 : x
2. Step 2: Convert to fraction form
   142,878/210,049 = 210,049/x
3. Step 3: Cross multiply
   142,878x = 210,049 × 210,049
4. Step 4: Simplify right side
   142,878x = 44,120,582,401
5. Step 5: Solve for x
   x = 44,120,582,401/142,878
6. Step 6: Final answer
   x = 308,798.99