Finding the Fourth Proportional to 21,540.84, 29,726.10 and 12,111

Step by Step Solution

1. Step 1: Write the proportion equation
   21,540.84 : 29,726.10 = 12,111 : x
2. Step 2: Convert to fraction form
   21,540.84/29,726.10 = 12,111/x
3. Step 3: Cross multiply
   21,540.84x = 29,726.10 × 12,111
4. Step 4: Simplify right side
   21,540.84x = 360,012,797.10
5. Step 5: Solve for x
   x = 360,012,797.10/21,540.84
6. Step 6: Final answer
   x = 16,713.03