Finding the Fourth Proportional to 21,646.83, 29,872.50 and 12,086.17

Step by Step Solution

1. Step 1: Write the proportion equation
   21,646.83 : 29,872.50 = 12,086.17 : x
2. Step 2: Convert to fraction form
   21,646.83/29,872.50 = 12,086.17/x
3. Step 3: Cross multiply
   21,646.83x = 29,872.50 × 12,086.17
4. Step 4: Simplify right side
   21,646.83x = 361,043,963.96
5. Step 5: Solve for x
   x = 361,043,963.96/21,646.83
6. Step 6: Final answer
   x = 16,678.84