Finding the Fourth Proportional to 12,155.16, 18,222.86 and 5,130.64

Step by Step Solution

1. Step 1: Write the proportion equation
   12,155.16 : 18,222.86 = 5,130.64 : x
2. Step 2: Convert to fraction form
   12,155.16/18,222.86 = 5,130.64/x
3. Step 3: Cross multiply
   12,155.16x = 18,222.86 × 5,130.64
4. Step 4: Simplify right side
   12,155.16x = 93,494,934.43
5. Step 5: Solve for x
   x = 93,494,934.43/12,155.16
6. Step 6: Final answer
   x = 7,691.79