Finding the Fourth Proportional to 10,581.17, 15,872.56 and 3,561.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,581.17 : 15,872.56 = 3,561.20 : x
2. Step 2: Convert to fraction form
   10,581.17/15,872.56 = 3,561.20/x
3. Step 3: Cross multiply
   10,581.17x = 15,872.56 × 3,561.20
4. Step 4: Simplify right side
   10,581.17x = 56,525,331.93
5. Step 5: Solve for x
   x = 56,525,331.93/10,581.17
6. Step 6: Final answer
   x = 5,342.07