Finding the Fourth Proportional to 9,989.29, 13,785.12 and 5,513.08

Step by Step Solution

1. Step 1: Write the proportion equation
   9,989.29 : 13,785.12 = 5,513.08 : x
2. Step 2: Convert to fraction form
   9,989.29/13,785.12 = 5,513.08/x
3. Step 3: Cross multiply
   9,989.29x = 13,785.12 × 5,513.08
4. Step 4: Simplify right side
   9,989.29x = 75,998,460.75
5. Step 5: Solve for x
   x = 75,998,460.75/9,989.29
6. Step 6: Final answer
   x = 7,607.99