Finding the Fourth Proportional to 23,099.78, 31,877.78 and 12,891.24

Step by Step Solution

1. Step 1: Write the proportion equation
   23,099.78 : 31,877.78 = 12,891.24 : x
2. Step 2: Convert to fraction form
   23,099.78/31,877.78 = 12,891.24/x
3. Step 3: Cross multiply
   23,099.78x = 31,877.78 × 12,891.24
4. Step 4: Simplify right side
   23,099.78x = 410,944,112.65
5. Step 5: Solve for x
   x = 410,944,112.65/23,099.78
6. Step 6: Final answer
   x = 17,789.96