Finding the Fourth Proportional to 21,556.56, 29,747.88 and 12,126

Step by Step Solution

1. Step 1: Write the proportion equation
   21,556.56 : 29,747.88 = 12,126 : x
2. Step 2: Convert to fraction form
   21,556.56/29,747.88 = 12,126/x
3. Step 3: Cross multiply
   21,556.56x = 29,747.88 × 12,126
4. Step 4: Simplify right side
   21,556.56x = 360,722,792.88
5. Step 5: Solve for x
   x = 360,722,792.88/21,556.56
6. Step 6: Final answer
   x = 16,733.78