Finding the Third Proportional to 143,379 and 311,908.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,379 : 311,908.50 = 311,908.50 : x
2. Step 2: Convert to fraction form
   143,379/311,908.50 = 311,908.50/x
3. Step 3: Cross multiply
   143,379x = 311,908.50 × 311,908.50
4. Step 4: Simplify right side
   143,379x = 97,286,912,372.25
5. Step 5: Solve for x
   x = 97,286,912,372.25/143,379
6. Step 6: Final answer
   x = 678,529.72