Finding the Third Proportional to 399,376 and 871,936

Step by Step Solution

1. Step 1: Write the proportion equation
   399,376 : 871,936 = 871,936 : x
2. Step 2: Convert to fraction form
   399,376/871,936 = 871,936/x
3. Step 3: Cross multiply
   399,376x = 871,936 × 871,936
4. Step 4: Simplify right side
   399,376x = 760,272,388,096
5. Step 5: Solve for x
   x = 760,272,388,096/399,376
6. Step 6: Final answer
   x = 1,903,650.67