Finding the Third Proportional to 428,250 and 666,900

Step by Step Solution

1. Step 1: Write the proportion equation
   428,250 : 666,900 = 666,900 : x
2. Step 2: Convert to fraction form
   428,250/666,900 = 666,900/x
3. Step 3: Cross multiply
   428,250x = 666,900 × 666,900
4. Step 4: Simplify right side
   428,250x = 444,755,610,000
5. Step 5: Solve for x
   x = 444,755,610,000/428,250
6. Step 6: Final answer
   x = 1,038,542.00