Finding the Third Proportional to 288,877.50 and 644,141.25

Step by Step Solution

1. Step 1: Write the proportion equation
   288,877.50 : 644,141.25 = 644,141.25 : x
2. Step 2: Convert to fraction form
   288,877.50/644,141.25 = 644,141.25/x
3. Step 3: Cross multiply
   288,877.50x = 644,141.25 × 644,141.25
4. Step 4: Simplify right side
   288,877.50x = 414,917,949,951.56
5. Step 5: Solve for x
   x = 414,917,949,951.56/288,877.50
6. Step 6: Final answer
   x = 1,436,311.07