Finding the Third Proportional to 318,183.50 and 686,156

Step by Step Solution

1. Step 1: Write the proportion equation
   318,183.50 : 686,156 = 686,156 : x
2. Step 2: Convert to fraction form
   318,183.50/686,156 = 686,156/x
3. Step 3: Cross multiply
   318,183.50x = 686,156 × 686,156
4. Step 4: Simplify right side
   318,183.50x = 470,810,056,336
5. Step 5: Solve for x
   x = 470,810,056,336/318,183.50
6. Step 6: Final answer
   x = 1,479,680.93