Finding the Fourth Proportional to 10,561.20, 15,844.56 and 3,987.48

Step by Step Solution

1. Step 1: Write the proportion equation
   10,561.20 : 15,844.56 = 3,987.48 : x
2. Step 2: Convert to fraction form
   10,561.20/15,844.56 = 3,987.48/x
3. Step 3: Cross multiply
   10,561.20x = 15,844.56 × 3,987.48
4. Step 4: Simplify right side
   10,561.20x = 63,179,866.11
5. Step 5: Solve for x
   x = 63,179,866.11/10,561.20
6. Step 6: Final answer
   x = 5,982.26