Finding the Fourth Proportional to 22,956.86, 31,678.04 and 12,886.41

Step by Step Solution

1. Step 1: Write the proportion equation
   22,956.86 : 31,678.04 = 12,886.41 : x
2. Step 2: Convert to fraction form
   22,956.86/31,678.04 = 12,886.41/x
3. Step 3: Cross multiply
   22,956.86x = 31,678.04 × 12,886.41
4. Step 4: Simplify right side
   22,956.86x = 408,216,319.60
5. Step 5: Solve for x
   x = 408,216,319.60/22,956.86
6. Step 6: Final answer
   x = 17,781.88