Finding the Fourth Proportional to 10,078.94, 13,915.72 and 9,013.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,078.94 : 13,915.72 = 9,013.40 : x
2. Step 2: Convert to fraction form
   10,078.94/13,915.72 = 9,013.40/x
3. Step 3: Cross multiply
   10,078.94x = 13,915.72 × 9,013.40
4. Step 4: Simplify right side
   10,078.94x = 125,427,858.54
5. Step 5: Solve for x
   x = 125,427,858.54/10,078.94
6. Step 6: Final answer
   x = 12,444.55