Finding the Fourth Proportional to 10,131.89, 13,974.75 and 8,785.08

Step by Step Solution

1. Step 1: Write the proportion equation
   10,131.89 : 13,974.75 = 8,785.08 : x
2. Step 2: Convert to fraction form
   10,131.89/13,974.75 = 8,785.08/x
3. Step 3: Cross multiply
   10,131.89x = 13,974.75 × 8,785.08
4. Step 4: Simplify right side
   10,131.89x = 122,769,296.73
5. Step 5: Solve for x
   x = 122,769,296.73/10,131.89
6. Step 6: Final answer
   x = 12,117.12