Finding the Third Proportional to 199,730 and 428,836

Step by Step Solution

1. Step 1: Write the proportion equation
   199,730 : 428,836 = 428,836 : x
2. Step 2: Convert to fraction form
   199,730/428,836 = 428,836/x
3. Step 3: Cross multiply
   199,730x = 428,836 × 428,836
4. Step 4: Simplify right side
   199,730x = 183,900,314,896
5. Step 5: Solve for x
   x = 183,900,314,896/199,730
6. Step 6: Final answer
   x = 920,744.58