Finding the Fourth Proportional to 9,915.67, 13,683.09 and 5,439.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,915.67 : 13,683.09 = 5,439.34 : x
2. Step 2: Convert to fraction form
   9,915.67/13,683.09 = 5,439.34/x
3. Step 3: Cross multiply
   9,915.67x = 13,683.09 × 5,439.34
4. Step 4: Simplify right side
   9,915.67x = 74,426,978.76
5. Step 5: Solve for x
   x = 74,426,978.76/9,915.67
6. Step 6: Final answer
   x = 7,506.00