Finding the Third Proportional to 144,356 and 321,520

Step by Step Solution

1. Step 1: Write the proportion equation
   144,356 : 321,520 = 321,520 : x
2. Step 2: Convert to fraction form
   144,356/321,520 = 321,520/x
3. Step 3: Cross multiply
   144,356x = 321,520 × 321,520
4. Step 4: Simplify right side
   144,356x = 103,375,110,400
5. Step 5: Solve for x
   x = 103,375,110,400/144,356
6. Step 6: Final answer
   x = 716,112.32