Finding the Fourth Proportional to 21,742.16, 30,004.54 and 12,181.94

Step by Step Solution

1. Step 1: Write the proportion equation
   21,742.16 : 30,004.54 = 12,181.94 : x
2. Step 2: Convert to fraction form
   21,742.16/30,004.54 = 12,181.94/x
3. Step 3: Cross multiply
   21,742.16x = 30,004.54 × 12,181.94
4. Step 4: Simplify right side
   21,742.16x = 365,513,506.01
5. Step 5: Solve for x
   x = 365,513,506.01/21,742.16
6. Step 6: Final answer
   x = 16,811.28