Finding the Third Proportional to 144,394.50 and 316,689

Step by Step Solution

1. Step 1: Write the proportion equation
   144,394.50 : 316,689 = 316,689 : x
2. Step 2: Convert to fraction form
   144,394.50/316,689 = 316,689/x
3. Step 3: Cross multiply
   144,394.50x = 316,689 × 316,689
4. Step 4: Simplify right side
   144,394.50x = 100,291,922,721
5. Step 5: Solve for x
   x = 100,291,922,721/144,394.50
6. Step 6: Final answer
   x = 694,568.86