Finding the Fourth Proportional to 13,078.50, 18,048.34 and 7,489.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,078.50 : 18,048.34 = 7,489.50 : x
2. Step 2: Convert to fraction form
   13,078.50/18,048.34 = 7,489.50/x
3. Step 3: Cross multiply
   13,078.50x = 18,048.34 × 7,489.50
4. Step 4: Simplify right side
   13,078.50x = 135,173,042.43
5. Step 5: Solve for x
   x = 135,173,042.43/13,078.50
6. Step 6: Final answer
   x = 10,335.52