Finding the Fourth Proportional to 3,578.41, 5,366.79 and 981.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,578.41 : 5,366.79 = 981.55 : x
2. Step 2: Convert to fraction form
   3,578.41/5,366.79 = 981.55/x
3. Step 3: Cross multiply
   3,578.41x = 5,366.79 × 981.55
4. Step 4: Simplify right side
   3,578.41x = 5,267,772.72
5. Step 5: Solve for x
   x = 5,267,772.72/3,578.41
6. Step 6: Final answer
   x = 1,472.10