Finding the Fourth Proportional to 13,422.16, 20,146.04 and 8,238.16

Step by Step Solution

1. Step 1: Write the proportion equation
   13,422.16 : 20,146.04 = 8,238.16 : x
2. Step 2: Convert to fraction form
   13,422.16/20,146.04 = 8,238.16/x
3. Step 3: Cross multiply
   13,422.16x = 20,146.04 × 8,238.16
4. Step 4: Simplify right side
   13,422.16x = 165,966,300.89
5. Step 5: Solve for x
   x = 165,966,300.89/13,422.16
6. Step 6: Final answer
   x = 12,365.10