Finding the Fourth Proportional to 16,685.39, 23,025.85 and 9,131.72

Step by Step Solution

1. Step 1: Write the proportion equation
   16,685.39 : 23,025.85 = 9,131.72 : x
2. Step 2: Convert to fraction form
   16,685.39/23,025.85 = 9,131.72/x
3. Step 3: Cross multiply
   16,685.39x = 23,025.85 × 9,131.72
4. Step 4: Simplify right side
   16,685.39x = 210,265,597.59
5. Step 5: Solve for x
   x = 210,265,597.59/16,685.39
6. Step 6: Final answer
   x = 12,601.78