Finding the Fourth Proportional to 492,796.25, 680,204.27 and 288,891.30

Step by Step Solution

1. Step 1: Write the proportion equation
   492,796.25 : 680,204.27 = 288,891.30 : x
2. Step 2: Convert to fraction form
   492,796.25/680,204.27 = 288,891.30/x
3. Step 3: Cross multiply
   492,796.25x = 680,204.27 × 288,891.30
4. Step 4: Simplify right side
   492,796.25x = 196,505,099,098.85
5. Step 5: Solve for x
   x = 196,505,099,098.85/492,796.25
6. Step 6: Final answer
   x = 398,755.27