Finding the Fourth Proportional to 21,111.35, 29,132.76 and 11,679.29

Step by Step Solution

1. Step 1: Write the proportion equation
   21,111.35 : 29,132.76 = 11,679.29 : x
2. Step 2: Convert to fraction form
   21,111.35/29,132.76 = 11,679.29/x
3. Step 3: Cross multiply
   21,111.35x = 29,132.76 × 11,679.29
4. Step 4: Simplify right side
   21,111.35x = 340,249,952.54
5. Step 5: Solve for x
   x = 340,249,952.54/21,111.35
6. Step 6: Final answer
   x = 16,116.92