Finding the Fourth Proportional to 7,321.50, 10,978.81 and 3,158.91

Step by Step Solution

1. Step 1: Write the proportion equation
   7,321.50 : 10,978.81 = 3,158.91 : x
2. Step 2: Convert to fraction form
   7,321.50/10,978.81 = 3,158.91/x
3. Step 3: Cross multiply
   7,321.50x = 10,978.81 × 3,158.91
4. Step 4: Simplify right side
   7,321.50x = 34,681,064.80
5. Step 5: Solve for x
   x = 34,681,064.80/7,321.50
6. Step 6: Final answer
   x = 4,736.88