Finding the Fourth Proportional to 13,120.52, 18,105.72 and 7,455.14

Step by Step Solution

1. Step 1: Write the proportion equation
   13,120.52 : 18,105.72 = 7,455.14 : x
2. Step 2: Convert to fraction form
   13,120.52/18,105.72 = 7,455.14/x
3. Step 3: Cross multiply
   13,120.52x = 18,105.72 × 7,455.14
4. Step 4: Simplify right side
   13,120.52x = 134,980,677.40
5. Step 5: Solve for x
   x = 134,980,677.40/13,120.52
6. Step 6: Final answer
   x = 10,287.75