Finding the Fourth Proportional to 21,902.74, 30,228.15 and 13,410.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,902.74 : 30,228.15 = 13,410.58 : x
2. Step 2: Convert to fraction form
   21,902.74/30,228.15 = 13,410.58/x
3. Step 3: Cross multiply
   21,902.74x = 30,228.15 × 13,410.58
4. Step 4: Simplify right side
   21,902.74x = 405,377,023.83
5. Step 5: Solve for x
   x = 405,377,023.83/21,902.74
6. Step 6: Final answer
   x = 18,508.05