Finding the Fourth Proportional to 21,826.56, 30,118.86 and 12,396.54

Step by Step Solution

1. Step 1: Write the proportion equation
   21,826.56 : 30,118.86 = 12,396.54 : x
2. Step 2: Convert to fraction form
   21,826.56/30,118.86 = 12,396.54/x
3. Step 3: Cross multiply
   21,826.56x = 30,118.86 × 12,396.54
4. Step 4: Simplify right side
   21,826.56x = 373,369,652.74
5. Step 5: Solve for x
   x = 373,369,652.74/21,826.56
6. Step 6: Final answer
   x = 17,106.21