Finding the Fourth Proportional to 16,661.51, 24,979.95 and 7,886.15

Step by Step Solution

1. Step 1: Write the proportion equation
   16,661.51 : 24,979.95 = 7,886.15 : x
2. Step 2: Convert to fraction form
   16,661.51/24,979.95 = 7,886.15/x
3. Step 3: Cross multiply
   16,661.51x = 24,979.95 × 7,886.15
4. Step 4: Simplify right side
   16,661.51x = 196,995,632.69
5. Step 5: Solve for x
   x = 196,995,632.69/16,661.51
6. Step 6: Final answer
   x = 11,823.40