Finding the Fourth Proportional to 21,802.96, 30,093.84 and 12,856.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,802.96 : 30,093.84 = 12,856.42 : x
2. Step 2: Convert to fraction form
   21,802.96/30,093.84 = 12,856.42/x
3. Step 3: Cross multiply
   21,802.96x = 30,093.84 × 12,856.42
4. Step 4: Simplify right side
   21,802.96x = 386,899,046.45
5. Step 5: Solve for x
   x = 386,899,046.45/21,802.96
6. Step 6: Final answer
   x = 17,745.25