Finding the Third Proportional to 269,908 and 428,892

Step by Step Solution

1. Step 1: Write the proportion equation
   269,908 : 428,892 = 428,892 : x
2. Step 2: Convert to fraction form
   269,908/428,892 = 428,892/x
3. Step 3: Cross multiply
   269,908x = 428,892 × 428,892
4. Step 4: Simplify right side
   269,908x = 183,948,347,664
5. Step 5: Solve for x
   x = 183,948,347,664/269,908
6. Step 6: Final answer
   x = 681,522.40