Finding the Fourth Proportional to 391,261, 539,945.78 and 227,913.31

Step by Step Solution

1. Step 1: Write the proportion equation
   391,261 : 539,945.78 = 227,913.31 : x
2. Step 2: Convert to fraction form
   391,261/539,945.78 = 227,913.31/x
3. Step 3: Cross multiply
   391,261x = 539,945.78 × 227,913.31
4. Step 4: Simplify right side
   391,261x = 123,060,829,940.33
5. Step 5: Solve for x
   x = 123,060,829,940.33/391,261
6. Step 6: Final answer
   x = 314,523.63