Finding the Fourth Proportional to 21,131.79, 29,162.33 and 11,572.08

Step by Step Solution

1. Step 1: Write the proportion equation
   21,131.79 : 29,162.33 = 11,572.08 : x
2. Step 2: Convert to fraction form
   21,131.79/29,162.33 = 11,572.08/x
3. Step 3: Cross multiply
   21,131.79x = 29,162.33 × 11,572.08
4. Step 4: Simplify right side
   21,131.79x = 337,468,757.89
5. Step 5: Solve for x
   x = 337,468,757.89/21,131.79
6. Step 6: Final answer
   x = 15,969.72