Finding the Fourth Proportional to 10,656.69, 15,986.40 and 5,719.56

Step by Step Solution

1. Step 1: Write the proportion equation
   10,656.69 : 15,986.40 = 5,719.56 : x
2. Step 2: Convert to fraction form
   10,656.69/15,986.40 = 5,719.56/x
3. Step 3: Cross multiply
   10,656.69x = 15,986.40 × 5,719.56
4. Step 4: Simplify right side
   10,656.69x = 91,435,173.98
5. Step 5: Solve for x
   x = 91,435,173.98/10,656.69
6. Step 6: Final answer
   x = 8,580.07