Finding the Fourth Proportional to 585,087.20, 820,228 and 585,087.20

Step by Step Solution

1. Step 1: Write the proportion equation
   585,087.20 : 820,228 = 585,087.20 : x
2. Step 2: Convert to fraction form
   585,087.20/820,228 = 585,087.20/x
3. Step 3: Cross multiply
   585,087.20x = 820,228 × 585,087.20
4. Step 4: Simplify right side
   585,087.20x = 479,904,903,881.60
5. Step 5: Solve for x
   x = 479,904,903,881.60/585,087.20
6. Step 6: Final answer
   x = 820,228