Finding the Fourth Proportional to 21,513.15, 29,687.94 and 12,081.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,513.15 : 29,687.94 = 12,081.69 : x
2. Step 2: Convert to fraction form
   21,513.15/29,687.94 = 12,081.69/x
3. Step 3: Cross multiply
   21,513.15x = 29,687.94 × 12,081.69
4. Step 4: Simplify right side
   21,513.15x = 358,680,487.82
5. Step 5: Solve for x
   x = 358,680,487.82/21,513.15
6. Step 6: Final answer
   x = 16,672.62