Finding the Third Proportional to 396,874.50 and 870,828

Step by Step Solution

1. Step 1: Write the proportion equation
   396,874.50 : 870,828 = 870,828 : x
2. Step 2: Convert to fraction form
   396,874.50/870,828 = 870,828/x
3. Step 3: Cross multiply
   396,874.50x = 870,828 × 870,828
4. Step 4: Simplify right side
   396,874.50x = 758,341,405,584
5. Step 5: Solve for x
   x = 758,341,405,584/396,874.50
6. Step 6: Final answer
   x = 1,910,783.90