Finding the Third Proportional to 288,816 and 644,038.50

Step by Step Solution

1. Step 1: Write the proportion equation
   288,816 : 644,038.50 = 644,038.50 : x
2. Step 2: Convert to fraction form
   288,816/644,038.50 = 644,038.50/x
3. Step 3: Cross multiply
   288,816x = 644,038.50 × 644,038.50
4. Step 4: Simplify right side
   288,816x = 414,785,589,482.25
5. Step 5: Solve for x
   x = 414,785,589,482.25/288,816
6. Step 6: Final answer
   x = 1,436,158.63