Finding the Third Proportional to 428,012 and 911,320

Step by Step Solution

1. Step 1: Write the proportion equation
   428,012 : 911,320 = 911,320 : x
2. Step 2: Convert to fraction form
   428,012/911,320 = 911,320/x
3. Step 3: Cross multiply
   428,012x = 911,320 × 911,320
4. Step 4: Simplify right side
   428,012x = 830,504,142,400
5. Step 5: Solve for x
   x = 830,504,142,400/428,012
6. Step 6: Final answer
   x = 1,940,375.84