Finding the Fourth Proportional to 10,986.72, 16,478.40 and 3,591.24

Step by Step Solution

1. Step 1: Write the proportion equation
   10,986.72 : 16,478.40 = 3,591.24 : x
2. Step 2: Convert to fraction form
   10,986.72/16,478.40 = 3,591.24/x
3. Step 3: Cross multiply
   10,986.72x = 16,478.40 × 3,591.24
4. Step 4: Simplify right side
   10,986.72x = 59,177,889.22
5. Step 5: Solve for x
   x = 59,177,889.22/10,986.72
6. Step 6: Final answer
   x = 5,386.31