Finding the Fourth Proportional to 9,915.48, 13,683.74 and 5,439.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,915.48 : 13,683.74 = 5,439.42 : x
2. Step 2: Convert to fraction form
   9,915.48/13,683.74 = 5,439.42/x
3. Step 3: Cross multiply
   9,915.48x = 13,683.74 × 5,439.42
4. Step 4: Simplify right side
   9,915.48x = 74,431,609.03
5. Step 5: Solve for x
   x = 74,431,609.03/9,915.48
6. Step 6: Final answer
   x = 7,506.61