Finding the Fourth Proportional to 12,111.04, 18,068.10 and 10,979.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.04 : 18,068.10 = 10,979.28 : x
2. Step 2: Convert to fraction form
   12,111.04/18,068.10 = 10,979.28/x
3. Step 3: Cross multiply
   12,111.04x = 18,068.10 × 10,979.28
4. Step 4: Simplify right side
   12,111.04x = 198,374,728.97
5. Step 5: Solve for x
   x = 198,374,728.97/12,111.04
6. Step 6: Final answer
   x = 16,379.66