Finding the Third Proportional to 287,928 and 672,637.50

Step by Step Solution

1. Step 1: Write the proportion equation
   287,928 : 672,637.50 = 672,637.50 : x
2. Step 2: Convert to fraction form
   287,928/672,637.50 = 672,637.50/x
3. Step 3: Cross multiply
   287,928x = 672,637.50 × 672,637.50
4. Step 4: Simplify right side
   287,928x = 452,441,206,406.25
5. Step 5: Solve for x
   x = 452,441,206,406.25/287,928
6. Step 6: Final answer
   x = 1,571,369.25