Finding the Fourth Proportional to 9,915.68, 13,683.65 and 5,439.46

Step by Step Solution

1. Step 1: Write the proportion equation
   9,915.68 : 13,683.65 = 5,439.46 : x
2. Step 2: Convert to fraction form
   9,915.68/13,683.65 = 5,439.46/x
3. Step 3: Cross multiply
   9,915.68x = 13,683.65 × 5,439.46
4. Step 4: Simplify right side
   9,915.68x = 74,431,666.83
5. Step 5: Solve for x
   x = 74,431,666.83/9,915.68
6. Step 6: Final answer
   x = 7,506.46