Finding the Fourth Proportional to 3,578.88, 5,368.72 and 981.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,578.88 : 5,368.72 = 981.76 : x
2. Step 2: Convert to fraction form
   3,578.88/5,368.72 = 981.76/x
3. Step 3: Cross multiply
   3,578.88x = 5,368.72 × 981.76
4. Step 4: Simplify right side
   3,578.88x = 5,270,794.55
5. Step 5: Solve for x
   x = 5,270,794.55/3,578.88
6. Step 6: Final answer
   x = 1,472.75