Finding the Third Proportional to 579,840 and 877,780.50

Step by Step Solution

1. Step 1: Write the proportion equation
   579,840 : 877,780.50 = 877,780.50 : x
2. Step 2: Convert to fraction form
   579,840/877,780.50 = 877,780.50/x
3. Step 3: Cross multiply
   579,840x = 877,780.50 × 877,780.50
4. Step 4: Simplify right side
   579,840x = 770,498,606,180.25
5. Step 5: Solve for x
   x = 770,498,606,180.25/579,840
6. Step 6: Final answer
   x = 1,328,812.44