Finding the Fourth Proportional to 7,321.56, 10,981.17 and 2,391.15

Step by Step Solution

1. Step 1: Write the proportion equation
   7,321.56 : 10,981.17 = 2,391.15 : x
2. Step 2: Convert to fraction form
   7,321.56/10,981.17 = 2,391.15/x
3. Step 3: Cross multiply
   7,321.56x = 10,981.17 × 2,391.15
4. Step 4: Simplify right side
   7,321.56x = 26,257,665.82
5. Step 5: Solve for x
   x = 26,257,665.82/7,321.56
6. Step 6: Final answer
   x = 3,586.35