Finding the Third Proportional to 428,883 and 916,665

Step by Step Solution

1. Step 1: Write the proportion equation
   428,883 : 916,665 = 916,665 : x
2. Step 2: Convert to fraction form
   428,883/916,665 = 916,665/x
3. Step 3: Cross multiply
   428,883x = 916,665 × 916,665
4. Step 4: Simplify right side
   428,883x = 840,274,722,225
5. Step 5: Solve for x
   x = 840,274,722,225/428,883
6. Step 6: Final answer
   x = 1,959,216.67