Finding the Fourth Proportional to 21,123.11, 29,156.37 and 12,176.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,123.11 : 29,156.37 = 12,176.58 : x
2. Step 2: Convert to fraction form
   21,123.11/29,156.37 = 12,176.58/x
3. Step 3: Cross multiply
   21,123.11x = 29,156.37 × 12,176.58
4. Step 4: Simplify right side
   21,123.11x = 355,024,871.81
5. Step 5: Solve for x
   x = 355,024,871.81/21,123.11
6. Step 6: Final answer
   x = 16,807.42