Finding the Fourth Proportional to 12,405.27, 17,128.35 and 8,622.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,405.27 : 17,128.35 = 8,622.12 : x
2. Step 2: Convert to fraction form
   12,405.27/17,128.35 = 8,622.12/x
3. Step 3: Cross multiply
   12,405.27x = 17,128.35 × 8,622.12
4. Step 4: Simplify right side
   12,405.27x = 147,682,689.10
5. Step 5: Solve for x
   x = 147,682,689.10/12,405.27
6. Step 6: Final answer
   x = 11,904.83