Finding the Fourth Proportional to 21,556.72, 29,746.56 and 12,126.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,556.72 : 29,746.56 = 12,126.88 : x
2. Step 2: Convert to fraction form
   21,556.72/29,746.56 = 12,126.88/x
3. Step 3: Cross multiply
   21,556.72x = 29,746.56 × 12,126.88
4. Step 4: Simplify right side
   21,556.72x = 360,732,963.53
5. Step 5: Solve for x
   x = 360,732,963.53/21,556.72
6. Step 6: Final answer
   x = 16,734.13