Finding the Third Proportional to 818,641.69 and 1,172,257.31

Step by Step Solution

1. Step 1: Write the proportion equation
   818,641.69 : 1,172,257.31 = 1,172,257.31 : x
2. Step 2: Convert to fraction form
   818,641.69/1,172,257.31 = 1,172,257.31/x
3. Step 3: Cross multiply
   818,641.69x = 1,172,257.31 × 1,172,257.31
4. Step 4: Simplify right side
   818,641.69x = 1,374,187,206,709.72
5. Step 5: Solve for x
   x = 1,374,187,206,709.72/818,641.69
6. Step 6: Final answer
   x = 1,678,618.65