Finding the Third Proportional to 208,916 and 428,896

Step by Step Solution

1. Step 1: Write the proportion equation
   208,916 : 428,896 = 428,896 : x
2. Step 2: Convert to fraction form
   208,916/428,896 = 428,896/x
3. Step 3: Cross multiply
   208,916x = 428,896 × 428,896
4. Step 4: Simplify right side
   208,916x = 183,951,778,816
5. Step 5: Solve for x
   x = 183,951,778,816/208,916
6. Step 6: Final answer
   x = 880,505.94