Finding the Fourth Proportional to 9,885.28, 13,641.57 and 5,408.99

Step by Step Solution

1. Step 1: Write the proportion equation
   9,885.28 : 13,641.57 = 5,408.99 : x
2. Step 2: Convert to fraction form
   9,885.28/13,641.57 = 5,408.99/x
3. Step 3: Cross multiply
   9,885.28x = 13,641.57 × 5,408.99
4. Step 4: Simplify right side
   9,885.28x = 73,787,047.51
5. Step 5: Solve for x
   x = 73,787,047.51/9,885.28
6. Step 6: Final answer
   x = 7,464.33