Finding the Fourth Proportional to 12,162.24, 16,785.52 and 7,128.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,162.24 : 16,785.52 = 7,128.45 : x
2. Step 2: Convert to fraction form
   12,162.24/16,785.52 = 7,128.45/x
3. Step 3: Cross multiply
   12,162.24x = 16,785.52 × 7,128.45
4. Step 4: Simplify right side
   12,162.24x = 119,654,722.22
5. Step 5: Solve for x
   x = 119,654,722.22/12,162.24
6. Step 6: Final answer
   x = 9,838.21