Finding the Third Proportional to 142,990 and 282,388

Step by Step Solution

1. Step 1: Write the proportion equation
   142,990 : 282,388 = 282,388 : x
2. Step 2: Convert to fraction form
   142,990/282,388 = 282,388/x
3. Step 3: Cross multiply
   142,990x = 282,388 × 282,388
4. Step 4: Simplify right side
   142,990x = 79,742,982,544
5. Step 5: Solve for x
   x = 79,742,982,544/142,990
6. Step 6: Final answer
   x = 557,682.23