Finding the Fourth Proportional to 22,923.88, 31,638.50 and 12,856.39

Step by Step Solution

1. Step 1: Write the proportion equation
   22,923.88 : 31,638.50 = 12,856.39 : x
2. Step 2: Convert to fraction form
   22,923.88/31,638.50 = 12,856.39/x
3. Step 3: Cross multiply
   22,923.88x = 31,638.50 × 12,856.39
4. Step 4: Simplify right side
   22,923.88x = 406,756,799.85
5. Step 5: Solve for x
   x = 406,756,799.85/22,923.88
6. Step 6: Final answer
   x = 17,743.80