Finding the Fourth Proportional to 492,076, 679,013.85 and 288,116.38

Step by Step Solution

1. Step 1: Write the proportion equation
   492,076 : 679,013.85 = 288,116.38 : x
2. Step 2: Convert to fraction form
   492,076/679,013.85 = 288,116.38/x
3. Step 3: Cross multiply
   492,076x = 679,013.85 × 288,116.38
4. Step 4: Simplify right side
   492,076x = 195,635,012,431.86
5. Step 5: Solve for x
   x = 195,635,012,431.86/492,076
6. Step 6: Final answer
   x = 397,570.73