Finding the Third Proportional to 287,907 and 619,555.50

Step by Step Solution

1. Step 1: Write the proportion equation
   287,907 : 619,555.50 = 619,555.50 : x
2. Step 2: Convert to fraction form
   287,907/619,555.50 = 619,555.50/x
3. Step 3: Cross multiply
   287,907x = 619,555.50 × 619,555.50
4. Step 4: Simplify right side
   287,907x = 383,849,017,580.25
5. Step 5: Solve for x
   x = 383,849,017,580.25/287,907
6. Step 6: Final answer
   x = 1,333,239.61