Finding the Fourth Proportional to 21,078.15, 29,093.90 and 13,913.29

Step by Step Solution

1. Step 1: Write the proportion equation
   21,078.15 : 29,093.90 = 13,913.29 : x
2. Step 2: Convert to fraction form
   21,078.15/29,093.90 = 13,913.29/x
3. Step 3: Cross multiply
   21,078.15x = 29,093.90 × 13,913.29
4. Step 4: Simplify right side
   21,078.15x = 404,791,867.93
5. Step 5: Solve for x
   x = 404,791,867.93/21,078.15
6. Step 6: Final answer
   x = 19,204.34