Finding the Fourth Proportional to 9,915.11, 13,683.23 and 5,439.05

Step by Step Solution

1. Step 1: Write the proportion equation
   9,915.11 : 13,683.23 = 5,439.05 : x
2. Step 2: Convert to fraction form
   9,915.11/13,683.23 = 5,439.05/x
3. Step 3: Cross multiply
   9,915.11x = 13,683.23 × 5,439.05
4. Step 4: Simplify right side
   9,915.11x = 74,423,676.52
5. Step 5: Solve for x
   x = 74,423,676.52/9,915.11
6. Step 6: Final answer
   x = 7,506.09