Finding the Fourth Proportional to 22,785.15, 31,436.04 and 12,711.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,785.15 : 31,436.04 = 12,711.72 : x
2. Step 2: Convert to fraction form
   22,785.15/31,436.04 = 12,711.72/x
3. Step 3: Cross multiply
   22,785.15x = 31,436.04 × 12,711.72
4. Step 4: Simplify right side
   22,785.15x = 399,606,138.39
5. Step 5: Solve for x
   x = 399,606,138.39/22,785.15
6. Step 6: Final answer
   x = 17,538.01