Finding the Third Proportional to 288,815 and 644,037.50

Step by Step Solution

1. Step 1: Write the proportion equation
   288,815 : 644,037.50 = 644,037.50 : x
2. Step 2: Convert to fraction form
   288,815/644,037.50 = 644,037.50/x
3. Step 3: Cross multiply
   288,815x = 644,037.50 × 644,037.50
4. Step 4: Simplify right side
   288,815x = 414,784,301,406.25
5. Step 5: Solve for x
   x = 414,784,301,406.25/288,815
6. Step 6: Final answer
   x = 1,436,159.14