Finding the Fourth Proportional to 21,516.78, 29,695.94 and 12,085.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,516.78 : 29,695.94 = 12,085.34 : x
2. Step 2: Convert to fraction form
   21,516.78/29,695.94 = 12,085.34/x
3. Step 3: Cross multiply
   21,516.78x = 29,695.94 × 12,085.34
4. Step 4: Simplify right side
   21,516.78x = 358,885,531.52
5. Step 5: Solve for x
   x = 358,885,531.52/21,516.78
6. Step 6: Final answer
   x = 16,679.33