Finding the Fourth Proportional to 22,780.28, 31,436.88 and 12,709.33

Step by Step Solution

1. Step 1: Write the proportion equation
   22,780.28 : 31,436.88 = 12,709.33 : x
2. Step 2: Convert to fraction form
   22,780.28/31,436.88 = 12,709.33/x
3. Step 3: Cross multiply
   22,780.28x = 31,436.88 × 12,709.33
4. Step 4: Simplify right side
   22,780.28x = 399,541,682.09
5. Step 5: Solve for x
   x = 399,541,682.09/22,780.28
6. Step 6: Final answer
   x = 17,538.93