Finding the Fourth Proportional to 9,919.97, 13,689.77 and 5,443.46

Step by Step Solution

1. Step 1: Write the proportion equation
   9,919.97 : 13,689.77 = 5,443.46 : x
2. Step 2: Convert to fraction form
   9,919.97/13,689.77 = 5,443.46/x
3. Step 3: Cross multiply
   9,919.97x = 13,689.77 × 5,443.46
4. Step 4: Simplify right side
   9,919.97x = 74,519,715.40
5. Step 5: Solve for x
   x = 74,519,715.40/9,919.97
6. Step 6: Final answer
   x = 7,512.09