Finding the Third Proportional to 208,918 and 428,900

Step by Step Solution

1. Step 1: Write the proportion equation
   208,918 : 428,900 = 428,900 : x
2. Step 2: Convert to fraction form
   208,918/428,900 = 428,900/x
3. Step 3: Cross multiply
   208,918x = 428,900 × 428,900
4. Step 4: Simplify right side
   208,918x = 183,955,210,000
5. Step 5: Solve for x
   x = 183,955,210,000/208,918
6. Step 6: Final answer
   x = 880,513.93