Finding the Third Proportional to 143,291.50 and 311,460

Step by Step Solution

1. Step 1: Write the proportion equation
   143,291.50 : 311,460 = 311,460 : x
2. Step 2: Convert to fraction form
   143,291.50/311,460 = 311,460/x
3. Step 3: Cross multiply
   143,291.50x = 311,460 × 311,460
4. Step 4: Simplify right side
   143,291.50x = 97,007,331,600
5. Step 5: Solve for x
   x = 97,007,331,600/143,291.50
6. Step 6: Final answer
   x = 676,992.92