Finding the Third Proportional to 428,900 and 916,700

Step by Step Solution

1. Step 1: Write the proportion equation
   428,900 : 916,700 = 916,700 : x
2. Step 2: Convert to fraction form
   428,900/916,700 = 916,700/x
3. Step 3: Cross multiply
   428,900x = 916,700 × 916,700
4. Step 4: Simplify right side
   428,900x = 840,338,890,000
5. Step 5: Solve for x
   x = 840,338,890,000/428,900
6. Step 6: Final answer
   x = 1,959,288.62