Finding the Fourth Proportional to 21,127.56, 29,153.82 and 12,173.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,127.56 : 29,153.82 = 12,173.28 : x
2. Step 2: Convert to fraction form
   21,127.56/29,153.82 = 12,173.28/x
3. Step 3: Cross multiply
   21,127.56x = 29,153.82 × 12,173.28
4. Step 4: Simplify right side
   21,127.56x = 354,897,613.93
5. Step 5: Solve for x
   x = 354,897,613.93/21,127.56
6. Step 6: Final answer
   x = 16,797.85