Finding the Fourth Proportional to 9,989.82, 13,785.94 and 5,513.57

Step by Step Solution

1. Step 1: Write the proportion equation
   9,989.82 : 13,785.94 = 5,513.57 : x
2. Step 2: Convert to fraction form
   9,989.82/13,785.94 = 5,513.57/x
3. Step 3: Cross multiply
   9,989.82x = 13,785.94 × 5,513.57
4. Step 4: Simplify right side
   9,989.82x = 76,009,745.21
5. Step 5: Solve for x
   x = 76,009,745.21/9,989.82
6. Step 6: Final answer
   x = 7,608.72