Finding the Fourth Proportional to 21,513.02, 29,687.78 and 12,081.38

Step by Step Solution

1. Step 1: Write the proportion equation
   21,513.02 : 29,687.78 = 12,081.38 : x
2. Step 2: Convert to fraction form
   21,513.02/29,687.78 = 12,081.38/x
3. Step 3: Cross multiply
   21,513.02x = 29,687.78 × 12,081.38
4. Step 4: Simplify right side
   21,513.02x = 358,669,233.30
5. Step 5: Solve for x
   x = 358,669,233.30/21,513.02
6. Step 6: Final answer
   x = 16,672.20