Finding the Third Proportional to 144,942 and 311,320.50

Step by Step Solution

1. Step 1: Write the proportion equation
   144,942 : 311,320.50 = 311,320.50 : x
2. Step 2: Convert to fraction form
   144,942/311,320.50 = 311,320.50/x
3. Step 3: Cross multiply
   144,942x = 311,320.50 × 311,320.50
4. Step 4: Simplify right side
   144,942x = 96,920,453,720.25
5. Step 5: Solve for x
   x = 96,920,453,720.25/144,942
6. Step 6: Final answer
   x = 668,684.40