Finding the Fourth Proportional to 21,426.16, 29,561.22 and 13,878.27

Step by Step Solution

1. Step 1: Write the proportion equation
   21,426.16 : 29,561.22 = 13,878.27 : x
2. Step 2: Convert to fraction form
   21,426.16/29,561.22 = 13,878.27/x
3. Step 3: Cross multiply
   21,426.16x = 29,561.22 × 13,878.27
4. Step 4: Simplify right side
   21,426.16x = 410,258,592.69
5. Step 5: Solve for x
   x = 410,258,592.69/21,426.16
6. Step 6: Final answer
   x = 19,147.56