Finding the Third Proportional to 144,149.63 and 315,454.50

Step by Step Solution

1. Step 1: Write the proportion equation
   144,149.63 : 315,454.50 = 315,454.50 : x
2. Step 2: Convert to fraction form
   144,149.63/315,454.50 = 315,454.50/x
3. Step 3: Cross multiply
   144,149.63x = 315,454.50 × 315,454.50
4. Step 4: Simplify right side
   144,149.63x = 99,511,541,570.25
5. Step 5: Solve for x
   x = 99,511,541,570.25/144,149.63
6. Step 6: Final answer
   x = 690,335.07