Finding the Fourth Proportional to 21,653.96, 29,886.42 and 18,111.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,653.96 : 29,886.42 = 18,111.56 : x
2. Step 2: Convert to fraction form
   21,653.96/29,886.42 = 18,111.56/x
3. Step 3: Cross multiply
   21,653.96x = 29,886.42 × 18,111.56
4. Step 4: Simplify right side
   21,653.96x = 541,289,689.02
5. Step 5: Solve for x
   x = 541,289,689.02/21,653.96
6. Step 6: Final answer
   x = 24,997.26