Finding the Third Proportional to 815,680 and 1,778,816

Step by Step Solution

1. Step 1: Write the proportion equation
   815,680 : 1,778,816 = 1,778,816 : x
2. Step 2: Convert to fraction form
   815,680/1,778,816 = 1,778,816/x
3. Step 3: Cross multiply
   815,680x = 1,778,816 × 1,778,816
4. Step 4: Simplify right side
   815,680x = 3,164,186,361,856
5. Step 5: Solve for x
   x = 3,164,186,361,856/815,680
6. Step 6: Final answer
   x = 3,879,200.62