Finding the Fourth Proportional to 21,856.24, 30,166.38 and 13,896.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,856.24 : 30,166.38 = 13,896.91 : x
2. Step 2: Convert to fraction form
   21,856.24/30,166.38 = 13,896.91/x
3. Step 3: Cross multiply
   21,856.24x = 30,166.38 × 13,896.91
4. Step 4: Simplify right side
   21,856.24x = 419,219,467.89
5. Step 5: Solve for x
   x = 419,219,467.89/21,856.24
6. Step 6: Final answer
   x = 19,180.77