Finding the Fourth Proportional to 21,326.88, 29,427.72 and 12,826.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,326.88 : 29,427.72 = 12,826.96 : x
2. Step 2: Convert to fraction form
   21,326.88/29,427.72 = 12,826.96/x
3. Step 3: Cross multiply
   21,326.88x = 29,427.72 × 12,826.96
4. Step 4: Simplify right side
   21,326.88x = 377,468,187.33
5. Step 5: Solve for x
   x = 377,468,187.33/21,326.88
6. Step 6: Final answer
   x = 17,699.18