Finding the Fourth Proportional to 11,870.56, 16,383.88 and 9,879.16

Step by Step Solution

1. Step 1: Write the proportion equation
   11,870.56 : 16,383.88 = 9,879.16 : x
2. Step 2: Convert to fraction form
   11,870.56/16,383.88 = 9,879.16/x
3. Step 3: Cross multiply
   11,870.56x = 16,383.88 × 9,879.16
4. Step 4: Simplify right side
   11,870.56x = 161,858,971.94
5. Step 5: Solve for x
   x = 161,858,971.94/11,870.56
6. Step 6: Final answer
   x = 13,635.33