Finding the Fourth Proportional to 21,538.56, 29,721.69 and 12,108.54

Step by Step Solution

1. Step 1: Write the proportion equation
   21,538.56 : 29,721.69 = 12,108.54 : x
2. Step 2: Convert to fraction form
   21,538.56/29,721.69 = 12,108.54/x
3. Step 3: Cross multiply
   21,538.56x = 29,721.69 × 12,108.54
4. Step 4: Simplify right side
   21,538.56x = 359,886,272.23
5. Step 5: Solve for x
   x = 359,886,272.23/21,538.56
6. Step 6: Final answer
   x = 16,708.93