Finding the Fourth Proportional to 9,919.82, 13,689.39 and 5,443.61

Step by Step Solution

1. Step 1: Write the proportion equation
   9,919.82 : 13,689.39 = 5,443.61 : x
2. Step 2: Convert to fraction form
   9,919.82/13,689.39 = 5,443.61/x
3. Step 3: Cross multiply
   9,919.82x = 13,689.39 × 5,443.61
4. Step 4: Simplify right side
   9,919.82x = 74,519,621.64
5. Step 5: Solve for x
   x = 74,519,621.64/9,919.82
6. Step 6: Final answer
   x = 7,512.20