Finding the Fourth Proportional to 9,989.22, 13,785.15 and 5,513.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,989.22 : 13,785.15 = 5,513.10 : x
2. Step 2: Convert to fraction form
   9,989.22/13,785.15 = 5,513.10/x
3. Step 3: Cross multiply
   9,989.22x = 13,785.15 × 5,513.10
4. Step 4: Simplify right side
   9,989.22x = 75,998,910.47
5. Step 5: Solve for x
   x = 75,998,910.47/9,989.22
6. Step 6: Final answer
   x = 7,608.09