Finding the Third Proportional to 147,171 and 317,870

Step by Step Solution

1. Step 1: Write the proportion equation
   147,171 : 317,870 = 317,870 : x
2. Step 2: Convert to fraction form
   147,171/317,870 = 317,870/x
3. Step 3: Cross multiply
   147,171x = 317,870 × 317,870
4. Step 4: Simplify right side
   147,171x = 101,041,336,900
5. Step 5: Solve for x
   x = 101,041,336,900/147,171
6. Step 6: Final answer
   x = 686,557.38