Finding the Fourth Proportional to 9,915.23, 13,683.42 and 5,439.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,915.23 : 13,683.42 = 5,439.15 : x
2. Step 2: Convert to fraction form
   9,915.23/13,683.42 = 5,439.15/x
3. Step 3: Cross multiply
   9,915.23x = 13,683.42 × 5,439.15
4. Step 4: Simplify right side
   9,915.23x = 74,426,173.89
5. Step 5: Solve for x
   x = 74,426,173.89/9,915.23
6. Step 6: Final answer
   x = 7,506.25