Finding the Fourth Proportional to 12,166.12, 18,256.38 and 5,145.74

Step by Step Solution

1. Step 1: Write the proportion equation
   12,166.12 : 18,256.38 = 5,145.74 : x
2. Step 2: Convert to fraction form
   12,166.12/18,256.38 = 5,145.74/x
3. Step 3: Cross multiply
   12,166.12x = 18,256.38 × 5,145.74
4. Step 4: Simplify right side
   12,166.12x = 93,942,584.82
5. Step 5: Solve for x
   x = 93,942,584.82/12,166.12
6. Step 6: Final answer
   x = 7,721.66