Finding the Fourth Proportional to 21,111.34, 29,133.48 and 11,680.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,111.34 : 29,133.48 = 11,680.42 : x
2. Step 2: Convert to fraction form
   21,111.34/29,133.48 = 11,680.42/x
3. Step 3: Cross multiply
   21,111.34x = 29,133.48 × 11,680.42
4. Step 4: Simplify right side
   21,111.34x = 340,291,282.46
5. Step 5: Solve for x
   x = 340,291,282.46/21,111.34
6. Step 6: Final answer
   x = 16,118.89