Finding the Third Proportional to 143,806.50 and 311,411.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,806.50 : 311,411.50 = 311,411.50 : x
2. Step 2: Convert to fraction form
   143,806.50/311,411.50 = 311,411.50/x
3. Step 3: Cross multiply
   143,806.50x = 311,411.50 × 311,411.50
4. Step 4: Simplify right side
   143,806.50x = 96,977,122,332.25
5. Step 5: Solve for x
   x = 96,977,122,332.25/143,806.50
6. Step 6: Final answer
   x = 674,358.41