Finding the Fourth Proportional to 723.98, 1,087.31 and 377.55

Step by Step Solution

1. Step 1: Write the proportion equation
   723.98 : 1,087.31 = 377.55 : x
2. Step 2: Convert to fraction form
   723.98/1,087.31 = 377.55/x
3. Step 3: Cross multiply
   723.98x = 1,087.31 × 377.55
4. Step 4: Simplify right side
   723.98x = 410,513.89
5. Step 5: Solve for x
   x = 410,513.89/723.98
6. Step 6: Final answer
   x = 567.02