Finding the Fourth Proportional to 21,540.94, 29,729.18 and 12,109.51

Step by Step Solution

1. Step 1: Write the proportion equation
   21,540.94 : 29,729.18 = 12,109.51 : x
2. Step 2: Convert to fraction form
   21,540.94/29,729.18 = 12,109.51/x
3. Step 3: Cross multiply
   21,540.94x = 29,729.18 × 12,109.51
4. Step 4: Simplify right side
   21,540.94x = 360,005,802.50
5. Step 5: Solve for x
   x = 360,005,802.50/21,540.94
6. Step 6: Final answer
   x = 16,712.63