Finding the Third Proportional to 142,818 and 311,030

Step by Step Solution

1. Step 1: Write the proportion equation
   142,818 : 311,030 = 311,030 : x
2. Step 2: Convert to fraction form
   142,818/311,030 = 311,030/x
3. Step 3: Cross multiply
   142,818x = 311,030 × 311,030
4. Step 4: Simplify right side
   142,818x = 96,739,660,900
5. Step 5: Solve for x
   x = 96,739,660,900/142,818
6. Step 6: Final answer
   x = 677,363.22