Finding the Fourth Proportional to 21,425.91, 29,540.16 and 13,858.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,425.91 : 29,540.16 = 13,858.89 : x
2. Step 2: Convert to fraction form
   21,425.91/29,540.16 = 13,858.89/x
3. Step 3: Cross multiply
   21,425.91x = 29,540.16 × 13,858.89
4. Step 4: Simplify right side
   21,425.91x = 409,393,828.02
5. Step 5: Solve for x
   x = 409,393,828.02/21,425.91
6. Step 6: Final answer
   x = 19,107.42