Finding the Fourth Proportional to 12,155.72, 18,202.03 and 10,411.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,155.72 : 18,202.03 = 10,411.91 : x
2. Step 2: Convert to fraction form
   12,155.72/18,202.03 = 10,411.91/x
3. Step 3: Cross multiply
   12,155.72x = 18,202.03 × 10,411.91
4. Step 4: Simplify right side
   12,155.72x = 189,517,846.12
5. Step 5: Solve for x
   x = 189,517,846.12/12,155.72
6. Step 6: Final answer
   x = 15,590.84