Finding the Fourth Proportional to 9,915.89, 13,683.78 and 5,439.83

Step by Step Solution

1. Step 1: Write the proportion equation
   9,915.89 : 13,683.78 = 5,439.83 : x
2. Step 2: Convert to fraction form
   9,915.89/13,683.78 = 5,439.83/x
3. Step 3: Cross multiply
   9,915.89x = 13,683.78 × 5,439.83
4. Step 4: Simplify right side
   9,915.89x = 74,437,368.54
5. Step 5: Solve for x
   x = 74,437,368.54/9,915.89
6. Step 6: Final answer
   x = 7,506.88