Finding the Fourth Proportional to 9,915.25, 13,683.22 and 5,439.23

Step by Step Solution

1. Step 1: Write the proportion equation
   9,915.25 : 13,683.22 = 5,439.23 : x
2. Step 2: Convert to fraction form
   9,915.25/13,683.22 = 5,439.23/x
3. Step 3: Cross multiply
   9,915.25x = 13,683.22 × 5,439.23
4. Step 4: Simplify right side
   9,915.25x = 74,426,112.30
5. Step 5: Solve for x
   x = 74,426,112.30/9,915.25
6. Step 6: Final answer
   x = 7,506.23