Finding the Fourth Proportional to 10,222.80, 14,100.42 and 9,879.96

Step by Step Solution

1. Step 1: Write the proportion equation
   10,222.80 : 14,100.42 = 9,879.96 : x
2. Step 2: Convert to fraction form
   10,222.80/14,100.42 = 9,879.96/x
3. Step 3: Cross multiply
   10,222.80x = 14,100.42 × 9,879.96
4. Step 4: Simplify right side
   10,222.80x = 139,311,585.58
5. Step 5: Solve for x
   x = 139,311,585.58/10,222.80
6. Step 6: Final answer
   x = 13,627.54