Finding the Third Proportional to 144,354 and 321,516

Step by Step Solution

1. Step 1: Write the proportion equation
   144,354 : 321,516 = 321,516 : x
2. Step 2: Convert to fraction form
   144,354/321,516 = 321,516/x
3. Step 3: Cross multiply
   144,354x = 321,516 × 321,516
4. Step 4: Simplify right side
   144,354x = 103,372,538,256
5. Step 5: Solve for x
   x = 103,372,538,256/144,354
6. Step 6: Final answer
   x = 716,104.43