Finding the Fourth Proportional to 1,042.98, 1,439.41 and 577.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.98 : 1,439.41 = 577.38 : x
2. Step 2: Convert to fraction form
   1,042.98/1,439.41 = 577.38/x
3. Step 3: Cross multiply
   1,042.98x = 1,439.41 × 577.38
4. Step 4: Simplify right side
   1,042.98x = 831,086.55
5. Step 5: Solve for x
   x = 831,086.55/1,042.98
6. Step 6: Final answer
   x = 796.84