Finding the Third Proportional to 143,292 and 311,458.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,292 : 311,458.50 = 311,458.50 : x
2. Step 2: Convert to fraction form
   143,292/311,458.50 = 311,458.50/x
3. Step 3: Cross multiply
   143,292x = 311,458.50 × 311,458.50
4. Step 4: Simplify right side
   143,292x = 97,006,397,222.25
5. Step 5: Solve for x
   x = 97,006,397,222.25/143,292
6. Step 6: Final answer
   x = 676,984.04