Finding the Fourth Proportional to 13,150.40, 18,145.92 and 7,485.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,150.40 : 18,145.92 = 7,485.88 : x
2. Step 2: Convert to fraction form
   13,150.40/18,145.92 = 7,485.88/x
3. Step 3: Cross multiply
   13,150.40x = 18,145.92 × 7,485.88
4. Step 4: Simplify right side
   13,150.40x = 135,838,179.61
5. Step 5: Solve for x
   x = 135,838,179.61/13,150.40
6. Step 6: Final answer
   x = 10,329.59