Finding the Fourth Proportional to 21,516.69, 29,694.35 and 12,085.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,516.69 : 29,694.35 = 12,085.25 : x
2. Step 2: Convert to fraction form
   21,516.69/29,694.35 = 12,085.25/x
3. Step 3: Cross multiply
   21,516.69x = 29,694.35 × 12,085.25
4. Step 4: Simplify right side
   21,516.69x = 358,863,643.34
5. Step 5: Solve for x
   x = 358,863,643.34/21,516.69
6. Step 6: Final answer
   x = 16,678.39