Finding the Fourth Proportional to 10,111.54, 13,967.54 and 9,168.39

Step by Step Solution

1. Step 1: Write the proportion equation
   10,111.54 : 13,967.54 = 9,168.39 : x
2. Step 2: Convert to fraction form
   10,111.54/13,967.54 = 9,168.39/x
3. Step 3: Cross multiply
   10,111.54x = 13,967.54 × 9,168.39
4. Step 4: Simplify right side
   10,111.54x = 128,059,854.06
5. Step 5: Solve for x
   x = 128,059,854.06/10,111.54
6. Step 6: Final answer
   x = 12,664.72