Finding the Fourth Proportional to 9,915.31, 13,683.44 and 5,439.37

Step by Step Solution

1. Step 1: Write the proportion equation
   9,915.31 : 13,683.44 = 5,439.37 : x
2. Step 2: Convert to fraction form
   9,915.31/13,683.44 = 5,439.37/x
3. Step 3: Cross multiply
   9,915.31x = 13,683.44 × 5,439.37
4. Step 4: Simplify right side
   9,915.31x = 74,429,248.00
5. Step 5: Solve for x
   x = 74,429,248.00/9,915.31
6. Step 6: Final answer
   x = 7,506.50