Finding the Third Proportional to 144,205.50 and 215,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   144,205.50 : 215,128.50 = 215,128.50 : x
2. Step 2: Convert to fraction form
   144,205.50/215,128.50 = 215,128.50/x
3. Step 3: Cross multiply
   144,205.50x = 215,128.50 × 215,128.50
4. Step 4: Simplify right side
   144,205.50x = 46,280,271,512.25
5. Step 5: Solve for x
   x = 46,280,271,512.25/144,205.50
6. Step 6: Final answer
   x = 320,932.78