Finding the Fourth Proportional to 21,842.28, 30,111.81 and 18,471.54

Step by Step Solution

1. Step 1: Write the proportion equation
   21,842.28 : 30,111.81 = 18,471.54 : x
2. Step 2: Convert to fraction form
   21,842.28/30,111.81 = 18,471.54/x
3. Step 3: Cross multiply
   21,842.28x = 30,111.81 × 18,471.54
4. Step 4: Simplify right side
   21,842.28x = 556,211,502.89
5. Step 5: Solve for x
   x = 556,211,502.89/21,842.28
6. Step 6: Final answer
   x = 25,464.90