Finding the Fourth Proportional to 21,123.36, 29,156.72 and 12,176.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21,123.36 : 29,156.72 = 12,176.83 : x
2. Step 2: Convert to fraction form
   21,123.36/29,156.72 = 12,176.83/x
3. Step 3: Cross multiply
   21,123.36x = 29,156.72 × 12,176.83
4. Step 4: Simplify right side
   21,123.36x = 355,036,361.91
5. Step 5: Solve for x
   x = 355,036,361.91/21,123.36
6. Step 6: Final answer
   x = 16,807.76