Finding the Third Proportional to 200,554 and 428,756

Step by Step Solution

1. Step 1: Write the proportion equation
   200,554 : 428,756 = 428,756 : x
2. Step 2: Convert to fraction form
   200,554/428,756 = 428,756/x
3. Step 3: Cross multiply
   200,554x = 428,756 × 428,756
4. Step 4: Simplify right side
   200,554x = 183,831,707,536
5. Step 5: Solve for x
   x = 183,831,707,536/200,554
6. Step 6: Final answer
   x = 916,619.50