Finding the Fourth Proportional to 497,007.89, 685,830.43 and 279,204.71

Step by Step Solution

1. Step 1: Write the proportion equation
   497,007.89 : 685,830.43 = 279,204.71 : x
2. Step 2: Convert to fraction form
   497,007.89/685,830.43 = 279,204.71/x
3. Step 3: Cross multiply
   497,007.89x = 685,830.43 × 279,204.71
4. Step 4: Simplify right side
   497,007.89x = 191,487,087,333.89
5. Step 5: Solve for x
   x = 191,487,087,333.89/497,007.89
6. Step 6: Final answer
   x = 385,279.78