Finding the Fourth Proportional to 13,120.28, 18,105.32 and 7,454.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,120.28 : 18,105.32 = 7,454.28 : x
2. Step 2: Convert to fraction form
   13,120.28/18,105.32 = 7,454.28/x
3. Step 3: Cross multiply
   13,120.28x = 18,105.32 × 7,454.28
4. Step 4: Simplify right side
   13,120.28x = 134,962,087.50
5. Step 5: Solve for x
   x = 134,962,087.50/13,120.28
6. Step 6: Final answer
   x = 10,286.53