Finding the Fourth Proportional to 9,986.94, 13,782.81 and 5,511.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,986.94 : 13,782.81 = 5,511.12 : x
2. Step 2: Convert to fraction form
   9,986.94/13,782.81 = 5,511.12/x
3. Step 3: Cross multiply
   9,986.94x = 13,782.81 × 5,511.12
4. Step 4: Simplify right side
   9,986.94x = 75,958,719.85
5. Step 5: Solve for x
   x = 75,958,719.85/9,986.94
6. Step 6: Final answer
   x = 7,605.81