Finding the Third Proportional to 143,370 and 311,890.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,370 : 311,890.50 = 311,890.50 : x
2. Step 2: Convert to fraction form
   143,370/311,890.50 = 311,890.50/x
3. Step 3: Cross multiply
   143,370x = 311,890.50 × 311,890.50
4. Step 4: Simplify right side
   143,370x = 97,275,683,990.25
5. Step 5: Solve for x
   x = 97,275,683,990.25/143,370
6. Step 6: Final answer
   x = 678,493.99