Finding the Fourth Proportional to 12,156.40, 18,221.82 and 5,134.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,156.40 : 18,221.82 = 5,134.96 : x
2. Step 2: Convert to fraction form
   12,156.40/18,221.82 = 5,134.96/x
3. Step 3: Cross multiply
   12,156.40x = 18,221.82 × 5,134.96
4. Step 4: Simplify right side
   12,156.40x = 93,568,316.83
5. Step 5: Solve for x
   x = 93,568,316.83/12,156.40
6. Step 6: Final answer
   x = 7,697.04