Finding the Fourth Proportional to 9,989.72, 13,785.60 and 5,513.38

Step by Step Solution

1. Step 1: Write the proportion equation
   9,989.72 : 13,785.60 = 5,513.38 : x
2. Step 2: Convert to fraction form
   9,989.72/13,785.60 = 5,513.38/x
3. Step 3: Cross multiply
   9,989.72x = 13,785.60 × 5,513.38
4. Step 4: Simplify right side
   9,989.72x = 76,005,251.33
5. Step 5: Solve for x
   x = 76,005,251.33/9,989.72
6. Step 6: Final answer
   x = 7,608.35