Finding the Third Proportional to 144,615 and 311,429.25

Step by Step Solution

1. Step 1: Write the proportion equation
   144,615 : 311,429.25 = 311,429.25 : x
2. Step 2: Convert to fraction form
   144,615/311,429.25 = 311,429.25/x
3. Step 3: Cross multiply
   144,615x = 311,429.25 × 311,429.25
4. Step 4: Simplify right side
   144,615x = 96,988,177,755.56
5. Step 5: Solve for x
   x = 96,988,177,755.56/144,615
6. Step 6: Final answer
   x = 670,664.71