Finding the Third Proportional to 396,680 and 871,984

Step by Step Solution

1. Step 1: Write the proportion equation
   396,680 : 871,984 = 871,984 : x
2. Step 2: Convert to fraction form
   396,680/871,984 = 871,984/x
3. Step 3: Cross multiply
   396,680x = 871,984 × 871,984
4. Step 4: Simplify right side
   396,680x = 760,356,096,256
5. Step 5: Solve for x
   x = 760,356,096,256/396,680
6. Step 6: Final answer
   x = 1,916,799.68